No Products in the Cart
Back To School 2026 SPECIAL DISCOUNT CODE: WEBACK26 for 20% OFF
The 2026 AP Physics C: Electricity & Magnetism U.S. exam is now the second full administration of the redesigned digital format — and it gives us the clearest picture yet of where this test is heading. After analyzing the 2026 U.S. paper line by line and stacking it against the 2026 Asia and Late forms, the 2025 U.S. and International papers, and the old-format 2024 booklets, three findings stand out. First, the new structure — 40 multiple-choice questions in 80 minutes plus 4 free-response questions in 100 minutes — is stable and, if anything, more predictable than the pre-2025 exam. Second, all four 2026 U.S. free-response questions land squarely on rotating archetypes that have appeared every year since 2024: a non-uniform current-density Ampère's-law derivation, a motional-emf loop, a four-part experimental-design lab, and a continuous-charge-distribution electric-field integration. Third, calculus has moved inside ordinary multiple-choice items: students now differentiate and integrate functions like E = βx² and J = kx inside single questions, not just in the FRQ section.
This guide is built from real AP Physics C: E&M past papers, not recycled textbook summaries. If you are searching for AP Physics C: E&M practice questions that actually look like the 2026 AP Physics C: E&M exam, the quotations and cross-year tables below show you exactly what the test writers keep asking — and what they are almost certain to ask again.
The 2026 exam is administered in May 2026 as a fully digital test (Bluebook app). The format that debuted in 2025 is unchanged, and it differs sharply from anything before 2025:
| Feature | 2026 U.S. Exam (current format) | 2024 & Earlier (old format) |
|---|---|---|
| Section I | 40 multiple-choice questions, 80 minutes | 35 multiple-choice questions, 45 minutes |
| Answer choices | 4 options (A–D) | 5 options (A–E) |
| Section II | 4 free-response questions, 100 minutes (~25 min each) | 3 free-response questions, 45 minutes (~15 min each) |
| Delivery | Digital (Bluebook) | Paper booklet |
| Pacing pressure | ~2.0 minutes per MCQ | ~1.3 minutes per MCQ |
Topic weighting on the 2026 U.S. paper (with question numbers so you can verify against the paper itself):
Combined, capacitor/RC/RL/LC content accounts for roughly a quarter to a third of Section I — the single biggest cluster on the exam and the most formulaic to prepare for.
The first two questions of the 2026 U.S. paper set the tone: fast proportional reasoning first, then a conceptual comparison dressed in the exam's signature "correctly compares" phrasing. Both are quoted verbatim below, together with the answers provided in the digital paper.
2026 AP Physics C: E&M — U.S. Exam, Section I, Question 1
"A battery, resistor of resistance R, and a resistor of resistance 3R are connected in series. During a time interval Δt, the total energy dissipated by the resistor of resistance R is 4E. What is the energy dissipated by the resistor of resistance 3R during the same time interval Δt?"
Our worked answer (expert-derived, not an official key): D — 12E.
This is a deliberate confidence-builder, but it encodes the exam's favorite circuit skill: in series, the same current I passes through both resistors, so the energy dissipated in a fixed interval scales as I²RΔt ∝ R. Tripling the resistance therefore triples the energy: 3 × 4E = 12E. Note the distractor design — 3E is the trap for students who misread 4E as the combined total and take the 3/4 share, 4E/3 inverts the ratio, and 4E appeals to a vague "same circuit, same energy" instinct. The 2026 Late form opens with the same series-energy item with rescaled numbers, which tells you the test writers consider single-step proportional reasoning a mandatory opener. (Throughout this guide, answers worked out by us rather than printed on an official key are labeled "expert-derived.")
2026 AP Physics C: E&M — U.S. Exam, Section I, Question 2
"Two nonconducting spheres are initially held fixed near each other and are isolated from other objects. Each sphere has mass m. The absolute value of charge on each sphere is |Q| and the charge is uniformly distributed throughout each sphere. Immediately after the spheres are released from rest, the spheres move away from each other. The magnitudes of the electric and gravitational forces that one sphere exerts on the other sphere are FE and Fg, respectively. Which of the following describes the charges on the spheres and correctly compares FE to Fg?"
Answer provided in the paper: A.
Two inferences must be chained: "move away from each other" forces same-sign charges, and for any laboratory-scale charges the Coulomb force dwarfs the gravitational force by dozens of orders of magnitude, so FE > Fg. What makes this a 2025-style item rather than a 2024-style one is the packaging — a physical observation (repulsion) that must be translated into a charge-sign claim plus a magnitude comparison. The same two-step "observe, then compare with justification" architecture reappears at Q16 (connected spheres), Q20 (RC current), and Q37 (field inside a conductor) on this very paper.
Place the 2026 U.S. free-response section next to the last three years and a rotation emerges that is too regular to ignore:
On the multiple-choice side, one stem now dominates: "Which of the following … and provides a valid justification?" It appears at 2026 U.S. Q4, Q16, Q20, and Q37; at 2025 U.S. Q16, Q25, Q29, and Q33; and at 2026 Asia Q2, Q9, Q20, and Q25. Old-format 2022–2024 papers rarely used it. The stem pairs a quantitative relation with conceptual reasoning, so two of the four options are usually eliminable by physics alone — a trainable skill.
The cross-version reuse is equally concrete. The 2026 Late form is essentially the U.S. item pool reordered: Late Q1 is the U.S. Q10 wire with J = kx; the Late FRQ sequence 41–44 matches U.S. FRQ4, FRQ2, FRQ1, FRQ3 respectively, with some numbers tweaked. And individual 2025 items reappear in 2026 with new packaging — compare 2025 U.S. Q16 (battery-connected capacitor, plates pulled apart, energy decreases) with 2026 Asia Q2 (isolated capacitor, plates pushed together, energy decreases) and 2026 U.S. Q29 (disconnected capacitor at 3d, acceleration ratio 1).
| Year & Version | Question | Topic | Difficulty | Pattern observed |
|---|---|---|---|---|
| 2026 U.S. | MCQ Q1 | Series resistors, energy ∝ R | Easy | Proportional-reasoning opener; reused on 2026 Late with new numbers |
| 2026 U.S. | MCQ Q4 | Lenz's law, loop entering field | Medium | "Provides a valid justification" signature stem |
| 2026 U.S. | MCQ Q36 | RL circuit differential equation | Medium | Annual diff-eq item, now appearing as MCQ |
| 2026 U.S. | FRQ1 | Ampère's law, J(r) = J₀(1 − r²/R²) | Hard | Direct successor to 2025 Intl FRQ 531 (J = Cr³) |
| 2026 U.S. | FRQ2 | Motional-emf loop, I–t graph | Medium–Hard | Same family as 2024 U.S. FRQ3 and 2025 U.S. Q40 |
| 2026 U.S. | FRQ3 | Circuit lab: ε–I slope, 1/I intercept | Medium | Fixed 4-part lab skeleton since 2025 |
| 2026 U.S. | FRQ4 | Semicircle ±λ, E-field by integration | Hard | Rotation: rod (2024) → line (2025 US) → arc (2025 Intl) → semicircle (2026) |
| 2026 Late | Q1 (= U.S. Q10) | Wire current from J = kx | Medium | Late form = U.S. pool reordered |
| 2026 Asia | Q23 | Wire current from J = βr² | Medium | Same ∫J dA skill, numeric variant |
| 2025 U.S. | Q24–26 | Two-way-switch RC trio | Medium | 3-item circuit cluster; echoed by 2026 Asia Q24–26 |
| 2025 Intl | FRQ 528 | RC charging: derive AND solve diff eq | Hard | International goes one step past "derive but do NOT solve" |
| 2025 Intl | 506 | Resistance of wire with ρ = αx | Hard | Calculus-in-MCQ, same mold as 2026 U.S. Q10 |
| 2024 U.S. (old format) | FRQ1 | Charged rod: flux, Ex sketch, V = kλ ln(x/(x−4L)) | Hard | Old-format ancestor of the integration FRQ |
| 2024 U.S. (old format) | FRQ2 | RL decay experiment → R | Medium | Lab question before the 2025 skeleton was formalized |
2026 AP Physics C: E&M — U.S. Exam, Section I, Question 4
"At the instant shown in the top view, a rectangular conducting loop slides along a horizontal surface at a constant speed in the +x direction toward a region of external, uniform magnetic field that is directed in the −z direction. Frictional forces between the loop and the surface are negligible. At time t = 0, the right side of the loop enters the field. At time tf, the left side of the loop enters the field. Which of the following indicates whether the speed of the loop decreases or remains constant during the time interval 0 < t < tf and provides a valid justification?"
Answer provided in the paper: B.
This is the signature 2025-style item: Lenz's-law physics compressed into a justification choice. While the loop enters, flux into the page increases, the induced current runs counterclockwise, and only the right side of the loop sits in the field — so the single force IL×B points in −x and the loop slows. Options A and C are "half-right physics, wrong application" distractors: the top and bottom forces cancel vertically, never pointing in −x. Notice that this exact physical situation graduates to a full free-response question as FRQ2 on the same paper — the test writers are signaling that loop-enters-field reasoning is worth practicing at both MCQ speed and FRQ depth.
2026 AP Physics C: E&M — U.S. Exam, Section I, Question 36
"The circuit shown consists of a battery of emf ε, two resistors, each of resistance R, an inductor of inductance L, and an initially open switch. The switch is closed at time t = 0. Which differential equation could be solved to describe the current I in the battery as a function of time t after the switch is closed?"
Answer provided in the paper: C (ε − IR/2 − L(dI/dt) = 0).
Every recent paper contains a "differential equation" checkpoint — 2022 and 2024 asked students to derive one in free response (velocity-dependent drag), 2025 International FRQ 528(a) asked students to derive (and then solve) one for RC charging, and here the 2026 U.S. paper simply asks you to recognize the correct Kirchhoff loop equation. The two parallel resistors halve the effective IR drop, which is why IR/2 is correct and 2IR is not. If you cannot produce ε − IR − L(dI/dt) = 0 for a series RL loop from memory, this question type will cost you points every single year.
2026 AP Physics C: E&M — U.S. Exam, Section II, FRQ 1 (quoted in part)
"Two long, straight, cylindrical wires, Wire S and Wire T, are each 200R long and each carries current I out of the page, as shown in the cross-sectional view above. Wire S has radius R, and the current is distributed over its cross section such that the current density varies with distance from the center according to J(r) = J₀(1 − r²/R²). Wire T is a thin wire of negligible radius located a distance 200R from Wire S along the positive x-axis."
Part A(i): "Use Ampère's law to derive an expression for the magnitude of the magnetic field at a distance r = 2R from the center of Wire S. Express your answer in terms of μ₀, J₀, and R."
Answer worked in the paper: B(2R) = μ₀J₀R/8 (enclosed current I = ∫₀R J₀(1 − r²/R²)·2πr dr = πJ₀R²/2, then B·2π(2R) = μ₀I).
The full question adds a By(z) sketch along the axis and a force-per-unit-length acceleration for Wire T. The skill chain is identical to 2025 International FRQ 531: integrate J over the cross section to get enclosed current, feed it to Ampère's law, then sketch B rising linearly inside the wire and falling as 1/z outside. Two habits separate full-credit answers from half-credit ones: writing Ampère's law symbolically before substituting (the rubric's first point), and marking the kink in the graph at r = R where the B ∝ r regime hands off to B ∝ 1/r. Students who had practiced the 2025 International paper's J = Cr³ wire walked into this question with the machinery already assembled.
2026 AP Physics C: E&M — U.S. Exam, Section II, FRQ 4 (quoted in part)
"A uniformly charged rod is bent into the shape of a semicircle of radius R. The upper half of the semicircle has positive linear charge density +λ, and the lower half has negative linear charge density −λ, as shown above."
Part B: "Derive an expression for the magnitude of the electric field E at the origin due to the entire charge distribution. Express your answer in terms of λ, R, ε₀, and physical constants as appropriate." Part C: "A student claims that if the radius of the semicircle is doubled to 2R while keeping λ the same, the electric field at the origin becomes E₁/4. Is the student's claim correct? Justify your answer."
Answer worked in the paper: E = 4kλ/R = λ/(πε₀R), directed −ŷ; the Part C claim is incorrect — for a line distribution E ∝ 1/R, not 1/R², so doubling R halves the field (E₂ = E₁/2).
This caps the four-year continuous-charge rotation (rod → line → arc → split semicircle). The integration itself is one line — dE = kλ dθ/R, keep only the sinθ component, ∫₀π sinθ dθ = 2, then double it for the second half — but the question is really grading symmetry reasoning in Part A (x-components cancel; both halves push the field downward) and scaling reasoning in Part C. That 1/R versus 1/R² trap is the single most-missed scaling distinction in E&M free response; the 2025 International arc question punished the same misconception from the other direction by having students derive EO = 2kλ/r and then explain potential-energy changes.
Predicted difficulty. The 2026 U.S. paper is comparable to 2025: Section I is front-loaded with proportional-reasoning items and saves its hardest work for the field-map, flux, and multi-step circuit items in the 20s and 30s. In Section II, FRQ1 (Ampère integration) and FRQ4 (charge integration) are the difficulty peaks; FRQ2 and FRQ3 are the most template-able and should be banked first.
What to prioritize, in order:
Common traps confirmed by the 2026 paper: treating an isolated capacitor like a battery-connected one (Q29 vs. Q31 test exactly this split); forgetting that E inside a conductor is zero because charge resides on the surface (Q37's wording matters); dropping the cosθ in flux (Q35); and assuming E from a line charge scales as 1/R² (FRQ4 Part C). On timing, 2 minutes per MCQ is generous only if you skip-and-return on the field-map diagrams; for FRQs, the printed pacing on recent papers averages about 25 minutes per question — spend it derivation-first, because every derivation part begins with the same instruction: "Begin your derivation by writing a fundamental physics principle or an equation from the reference information."
The 2026 U.S. exam rewards preparation that is specific, not generic. Its four free-response questions continue rotations that have been running since 2024; its multiple-choice section recycles justification stems and calculus items that already appeared in 2025; and its Late sibling literally reuses the same item pool in a different order. A student who has worked through the 2024, 2025, and 2026 papers has, in effect, already seen the skeleton of every question on this exam — the numbers and scenarios change, but the physics being asked for does not. That is what makes real past papers the highest-quality practice available: they are the only materials that are guaranteed to match the exam's structure, wording, and difficulty. Work them under timed conditions, study the scoring language, and walk into May with the confidence that nothing on the paper will surprise you.
Everything in this analysis — the quoted questions, the archetype rotations, the justification stems — comes directly from authentic past papers. Get the full collection and start practicing with the real thing:
Recent Popular Subjects
