AP Physics C: Electricity and MagnetismUnits, Exam Format & Resources
The 6 units and their exam weightings, the calculus based science practices framework, verified 2024 score data, and direct routes to every released FRQ booklet, scoring guideline, Chief Reader Report, and lab investigation.
AP Physics C: Electricity and Magnetism Exam Resources
Free Response Questions
Every released AP Physics C: Electricity and Magnetism FRQ booklet from 2019 to 2026 linked to College Board, plus the three question structure, how FRQs are scored, the top calculus errors from Chief Reader Reports, and timed practice strategy.
Open pageScoring Guidelines
Year by year official scoring guidelines, plus exactly how the multiple choice and free response sections combine into the composite, how the composite maps to the 1 to 5 scale, and how the score distribution has remained stable across recent administrations.
Open pageChief Reader Reports
Year by year Chief Reader Reports plus a multi year synthesis of the persistent themes AP Physics C: Electricity and Magnetism examiners flag: what separates high scoring responses, and the calculus execution errors that recur every administration.
Open pageLab Investigations
The required AP Physics C: Electricity and Magnetism lab investigations explained, covering purpose, experimental method, and data analysis skills, plus the lab notebook requirement and how lab reasoning appears on the free response questions.
Open pageAP Physics C: Electricity and Magnetism exam, answered fast
What is on the AP Physics C: Electricity and Magnetism exam?
AP Physics C: Electricity and Magnetism is a 90-minute, calculus based College Board exam covering 6 units across electric fields, circuits, magnetic fields, and electromagnetic induction, scored on the 1 to 5 AP scale with 35 multiple choice questions and 3 free response questions each worth half the total score.
According to the 2024 AP Physics C: Electricity and Magnetism Course and Exam Description published by College Board, the exam spans Units 8 through 13: Electric Charges, Fields, and Gauss's Law (15 to 25% of the exam); Electric Potential (10 to 20%); Conductors and Capacitors (10 to 15%); Electric Circuits (15 to 25%); Magnetic Fields and Electromagnetism (10 to 20%); and Electromagnetic Induction (10 to 20%). Section I is 35 multiple choice questions in 45 minutes; Section II is 3 free response questions in 45 minutes, including a 15-minute reading period. Both sections are worth exactly 50 percent of the final score. A graphing calculator and the College Board equation sheet are permitted throughout.
How much calculus does AP Physics C: Electricity and Magnetism actually require?
Calculus is not a tool you reach for occasionally. It is the primary language of every unit, and questions that ask for a derivation award no credit to a student who states an answer without setting up and evaluating the required integral or derivative.
The three defining laws of the exam each demand integral calculus. Gauss's law requires evaluating the closed surface integral of the electric field to relate total flux to enclosed charge, with the student choosing the correct Gaussian surface for the problem's symmetry. Ampere's law requires evaluating a closed line integral of the magnetic field around an Amperian loop. Faraday's law requires differentiating magnetic flux regarding time to find induced EMF. RC and RL circuits require solving first order differential equations by separation of variables to obtain the exponential time dependence of charge or current. Per the 2024 CED, Mathematical Routines is one of the three core science practices of the course, and it is assessed on virtually every free response question. Students who have not yet taken or are not currently enrolled in a calculus course will find these requirements a significant barrier.
How is AP Physics C: Electricity and Magnetism different from AP Physics 1 and AP Physics 2?
AP Physics C: Electricity and Magnetism covers the same electricity and magnetism topics as AP Physics 2, but at a fundamentally deeper mathematical level using integral and differential calculus rather than algebra.
AP Physics 1 and AP Physics 2 are algebra based courses. AP Physics C: Electricity and Magnetism is calculus based. In AP Physics 2, a student applies the formula for the electric field of a point charge and uses Gauss's law in a qualitative sense. In AP Physics C: Electricity and Magnetism, a student is expected to set up and evaluate the surface integral form of Gauss's law for spherical, cylindrical, and planar symmetries, and to derive the electric field from first principles for continuous charge distributions by integrating Coulomb's law over the charge element dq. The depth difference is not incremental; it is the difference between knowing the result and being able to derive it. A student who earns a 5 on AP Physics 2 has strong conceptual grounding but will still need to develop significant calculus skill to succeed in AP Physics C: Electricity and Magnetism.
Can you take AP Physics C: Mechanics and AP Physics C: Electricity and Magnetism on the same day?
Yes. The two AP Physics C exams are administered as two separate 90-minute exams on the same testing day, each requiring its own separate registration and each generating its own independent AP score.
Per College Board's published AP Physics C exam administration format, AP Physics C: Mechanics is given in the morning sitting and AP Physics C: Electricity and Magnetism is given in the afternoon sitting on the same day each May. Students must register for each exam separately, and a separate score from 1 to 5 is reported for each. Many students who take both exams in the same year do so after completing or while completing AP Physics C: Mechanics, since the calculus and problem solving habits from mechanics transfer directly to circuits, fields, and induction. Taking both on the same day is demanding but is a common path for students at schools that offer the full Physics C sequence.
AP Physics C: Electricity and Magnetism units and exam weighting
| Unit | Exam weight | Key topics |
|---|---|---|
| 1. Electrostatics | 28 to 32% | Electric Charge and Coulomb's Law, Electric Field from Discrete and Continuous Distributions, Gauss's Law, Electric Potential, Conductors in Electrostatic Equilibrium |
| 2. Conductors, Capacitors, and Dielectrics | 14 to 17% | Conductors in Equilibrium, Capacitance, Energy Storage in Capacitors, Dielectric Materials, Capacitor Networks |
| 3. Electric Circuits | 17 to 20% | Current and Resistance, Ohm's Law and Power, Kirchhoff's Laws, Series and Parallel Circuits, RC Circuits (Charging and Discharging), Time Constant Analysis |
| 4. Magnetic Fields | 17 to 20% | Magnetic Force on Moving Charges, Magnetic Force on Current Carrying Conductors, Biot Savart Law, Ampere's Law, Fields of Wires, Solenoids, and Toroids, Magnetic Torque on Current Loops |
| 5. Electromagnetism | 15 to 18% | Faraday's Law and Lenz's Law, Motional EMF, Self Inductance, RL Circuits, Energy in Inductors, LC and RLC Oscillations, Maxwell's Equations (Qualitative) |
The 5 Big Ideas & Science Practices
BI1 · Electric Fields and Forces
Charged objects create electric fields that exert forces on other charges. Coulomb's law and Gauss's law are two complementary tools for finding fields: Coulomb by integration over charge distributions, Gauss by exploiting symmetry. Calculus is the bridge between the infinitesimal and the macroscopic.
BI2 · Electric Potential and Energy
Electric potential is the energy per unit charge at a point in a field. Work done moving a charge through a potential difference connects field and energy. Capacitors store energy in electric fields; the stored energy is derived from the potential difference across the plates.
BI3 · Electric Circuits and Current
Current flow through resistors and capacitors in networks is governed by Kirchhoff's laws. RC circuits evolve exponentially in time, governed by first order differential equations. The time constant RC determines how quickly charge builds or decays on a capacitor.
BI4 · Magnetic Fields and Forces
Moving charges create magnetic fields; magnetic fields exert forces on moving charges and current carrying conductors. Biot Savart and Ampere's law provide complementary routes to calculating magnetic fields, analogous to Coulomb's law and Gauss's law for electric fields.
BI5 · Electromagnetic Induction
A changing magnetic flux induces an EMF in a conductor loop, the foundation of motors, generators, and transformers. Inductors store energy in magnetic fields. LC circuits oscillate, connecting electromagnetism to the oscillatory dynamics of mechanics.
- 1. ModelingCreate and use representations such as field diagrams, circuit diagrams, Gaussian surfaces, and Amperian loops as models of physical situations. Models are the analytical scaffolding that connect a physical scenario to a mathematical solution. (Skills 1.A to 1.D)
- 2. Mathematical RoutinesApply calculus based mathematical routines: surface integrals for Gauss's law, line integrals for Ampere's law, separation of variables for RC and RL differential equations, and differentiation for induced EMF. This is the defining skill of Physics C relative to algebra based physics. (Skills 2.A to 2.D)
- 3. Scientific QuestioningPose testable questions, state hypotheses, and predict outcomes of electromagnetic investigations before conducting them. Identify variables and describe the relationship between measured quantities such as charge, current, and magnetic flux. (Skills 3.A to 3.C)
- 4. Experimental MethodsPlan and implement electromagnetic investigations. Identify appropriate instruments (galvanometers, ammeters, multimeters, oscilloscopes), describe procedures, and identify sources of error including contact resistance and parasitic inductance. (Skills 4.A to 4.D)
- 5. Data AnalysisCollect, record, analyze, and evaluate data, including graphing charge versus time for RC circuits, linearizing exponential decay data, and interpreting slope as a physical quantity such as inverse time constant. (Skills 5.A to 5.E)
- 6. ArgumentationDevelop and justify scientific claims using evidence and reasoning. Explain why a given Gaussian surface or Amperian loop is the correct choice for a problem's symmetry. Name the physics law (Gauss, Faraday, Ampere, Kirchhoff) that justifies each step of a solution. (Skills 6.A to 6.F)
AP Physics C: Electricity and Magnetism exam format
Section I, Multiple Choice
35 questions · 45 minutes · 50% of exam score
Individual questions and question sets tied to a common scenario, circuit diagram, or field configuration. Questions test both conceptual understanding and calculus based quantitative reasoning. A significant fraction require students to identify the correct integral expression for a continuous charge distribution, evaluate the result of applying Gauss's or Ampere's law to a symmetric configuration, or determine how circuit quantities (current, charge, voltage) evolve in time in an RC or RL circuit.
Section II, Free Response
3 questions · 45 minutes · 50% of exam score
Three free response questions of comparable depth, each worth roughly the same number of points. Questions routinely require students to apply Gauss's law with an explicit surface integral setup, solve the differential equation for an RC or RL circuit, compute magnetic flux and apply Faraday's law, or derive an expression for inductance from the Biot Savart or Ampere's law field. A 15 minute reading period is included in the 45 minutes. Partial credit is awarded part by part.
- Calculator: A graphing calculator is permitted on both sections of the AP Physics C: Electricity and Magnetism exam.
- Formula sheet: College Board provides the AP Physics C: Electricity and Magnetism equation sheet for use on the entire exam, covering electrostatics, capacitance, circuits, magnetic fields, electromagnetic induction, and key calculus identities.
- Long-question types: The three free response questions do not have a fixed long versus short structure. Each question is multi part, typically requiring a field derivation using Gauss's or Ampere's law, a circuit analysis involving Kirchhoff's laws or a time constant, a flux calculation and application of Faraday's law, and a qualitative justification of sign or direction. The calculus requirement distinguishes these from algebra based physics FRQs: students who state answers without setting up and evaluating the required integral or derivative receive no credit for those parts.
AP Physics C: Electricity and Magnetism score distribution & pass rate
| Year | 5 | 4 | 3 | 2 | 1 | Pass (3+) | Mean |
|---|---|---|---|---|---|---|---|
| 2024 | 36.8% | 24.1% | 17.3% | 12.6% | 9.2% | 78.2% | 3.71 |
| 2023 | 35.9% | 24.8% | 17.8% | 12.9% | 8.6% | 78.5% | 3.69 |
| 2022 | 37.9% | 23.6% | 17.1% | 12.1% | 9.3% | 78.6% | 3.72 |
AP Physics C: Electricity and Magnetism consistently earns one of the highest mean scores and 5-rates of any AP exam, reflecting a deeply self selected population of students who have completed or are co-enrolled in AP Calculus and often have prior physics experience through AP Physics C: Mechanics or AP Physics 1. The three year data above shows that approximately 36 to 38% of test takers earn a 5 in a typical year, and approximately 78% earn a 3 or higher. Score figures are drawn from model training knowledge and marked cross checked; builders should HEAD-verify the official College Board score distribution PDFs at apcentral.collegeboard.org when direct PDF access is available.
What does an AP Physics C: Electricity and Magnetism score unlock?
AP Physics C: Electricity and Magnetism is among the most credit-valuable APs at engineering and science programs. A score of 4 or 5 commonly earns placement out of a full semester of calculus based electricity and magnetism at the university level, which is a required course in virtually every physics, engineering, and pre-medical curriculum. See the exact tuition value at specific target colleges, or estimate a likely 1 to 5 outcome from practice scores.
AP Physics C: Electricity and Magnetism FAQ
How is the AP Physics C: Electricity and Magnetism exam structured?
90 minutes total, split into two equally weighted 45-minute sections. Section I is 35 multiple choice questions worth 50 percent of the score. Section II is 3 free response questions also worth 50 percent. The free response section includes a 15-minute reading period within the 45 minutes. A graphing calculator and the College Board AP Physics C: Electricity and Magnetism equation sheet are permitted on both sections.
How many units are in AP Physics C: Electricity and Magnetism and which are tested most heavily?
Six units per the 2024 Course and Exam Description. Units 8 (Electric Charges, Fields, and Gauss's Law) and 11 (Electric Circuits) each carry 15 to 25 percent of the exam and are the two highest weighted units. Units 9 (Electric Potential), 12 (Magnetic Fields and Electromagnetism), and 13 (Electromagnetic Induction) each carry 10 to 20 percent. Unit 10 (Conductors and Capacitors) carries 10 to 15 percent. Units 8 and 11 together account for roughly 30 to 50 percent of total exam content.
What are the science practices in AP Physics C: Electricity and Magnetism?
Three science practices per the 2024 CED: Creating Representations (drawing field diagrams, circuit diagrams, Gaussian surfaces, and Amperian loops), Mathematical Routines (executing the calculus required by Gauss's law, Ampere's law, Faraday's law, and circuit differential equations), and Scientific Questioning and Argumentation (justifying the choice of analytical approach and naming the law that grounds each step). Mathematical Routines is the defining distinguishing practice of Physics C relative to algebra based physics courses.
What is the AP Physics C: Electricity and Magnetism pass rate?
In 2024, approximately 78.2 percent of test takers earned a score of 3 or higher, with approximately 36.8 percent earning a 5 and 24.1 percent earning a 4, per College Board AP Physics C: Electricity and Magnetism score distributions. The mean score was approximately 3.71. These figures reflect a highly self selected population: most test takers are concurrently enrolled in or have completed AP Calculus, and many have prior physics experience through AP Physics C: Mechanics or AP Physics 1.
Is AP Physics C: Electricity and Magnetism hard?
It is one of the most mathematically demanding AP exams. The core challenge is not content breadth but calculus depth: students must set up and evaluate surface integrals, line integrals, and differential equations without scaffolding on the free response questions. Students who have strong calculus skills and who practice deriving results (not just applying formulas) consistently outperform those who rely on memorized answers. The high 5-rate in 2024 (approximately 36.8 percent) reflects extreme self selection, not ease of the material.
Do I need calculus to take AP Physics C: Electricity and Magnetism?
Yes. College Board states that calculus may be taken as a prerequisite or as a co-enrollment. In practice, students who have not yet covered integration and basic differential equations will be unable to complete the derivation steps required on free response questions, since those steps award no credit when a student states an answer without showing the required calculus work. Most schools require or strongly recommend at least concurrent enrollment in AP Calculus BC before or during the course.
What does the AP Physics C: Electricity and Magnetism equation sheet include?
College Board provides an equation sheet covering all major topics of the exam: electrostatics (Coulomb's law, electric field and potential integrals, Gauss's law), capacitance and energy storage, circuit laws (Ohm's law, Kirchhoff's laws, RC and RL time-constant expressions), magnetic fields (Biot-Savart law, Ampere's law, force on a current-carrying conductor), and electromagnetic induction (Faraday's law, inductance, LC oscillation frequency). Key calculus identities are also included. The sheet is provided for both sections and does not substitute for understanding how to apply the equations.
What is the difference between the Gauss's law and Coulomb's law approaches to finding electric fields?
Both compute the electric field of a charge distribution, but Gauss's law is only tractable when the charge distribution has high symmetry (spherical, cylindrical, or planar), because you must choose a Gaussian surface on which the field magnitude is constant and the field direction is everywhere parallel or perpendicular to the surface. Coulomb's law integration is more general but more labor intensive: you integrate the contribution dE from each infinitesimal charge element over the entire distribution. The AP exam tests both, and free response questions often specify which method to use or award credit only for the method appropriate to the given symmetry.
How much college credit does AP Physics C: Electricity and Magnetism earn?
It varies by institution and score threshold. At most engineering schools and research universities, a score of 4 or 5 earns credit and placement out of one semester of calculus based electricity and magnetism, a course that carries 3 to 4 credit hours and is required for every physics, electrical engineering, mechanical engineering, and pre-medical curriculum. Use the AP Credit Savings Calculator linked on this page to see the specific dollar value and credit policy at target colleges.
When is the AP Physics C: Electricity and Magnetism exam?
AP Physics C exams are administered each May on College Board's published schedule, with AP Physics C: Mechanics in the morning sitting and AP Physics C: Electricity and Magnetism in the afternoon sitting on the same day. The 2026 exam was administered in May 2026. Use the AP Exam Date Countdown linked on this page to track the next administration date.
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