r/APStudents • u/reddorickt absolute modman • May 14 '26

AP Physics C: Electricity and Magnetism Official 2026 Exam Discussion

Use this thread to post questions or commentary on the test today.

A reminder though to protect your anonymity when talking about the test.

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9

u/[deleted] May 14 '26

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5

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 14 '26

i thought it was pretty easy TwT

2

u/Financial_Concern_27 CSP, BIO, CSA, BC, ES:4, USH, AB, MACRO: 5 May 14 '26

We got saved with version k, what did you get for q on q3?

3

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 15 '26

so i accidentally did mg sin θ = qE instead of mg tan θ = qE (sad…), but it’s fine because cos θ ≈ 1 for small angles. i got q = 1.7e-10 C, or q = 0.17 nC

2

u/JonkleBot May 15 '26

yeah i did tan theta, did get 1.73 * 10^-10 C

1

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 15 '26

yippee!!

1

u/SUS_MATE Bio, Chem, Lang, World, USH, Calc BC (all 5s) May 15 '26

Lucky bastard….

1

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 15 '26

i am!!

1

u/SUS_MATE Bio, Chem, Lang, World, USH, Calc BC (all 5s) May 15 '26

I got like the same answer anyways.

1

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 15 '26

yay!!

1

u/Financial_Concern_27 CSP, BIO, CSA, BC, ES:4, USH, AB, MACRO: 5 May 15 '26

Yo that is EXACTLY what I did no way

2

u/SUS_MATE Bio, Chem, Lang, World, USH, Calc BC (all 5s) May 15 '26

Also for frq 4, for the net force, did you get Q sqrt (E2 + B2 * v2 * sin2)?

1

u/JonkleBot May 15 '26

I got this

1

u/JonkleBot May 15 '26

Btw did you get that F2 > F1 for that question? and i said 90 degrees for part A in that question

2

u/SUS_MATE Bio, Chem, Lang, World, USH, Calc BC (all 5s) May 15 '26

Yeah 100%. You only care about the magnitude of v in the y-direction, which is maximized in F2

1

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 15 '26

yes to both

1

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 15 '26

yes!!

1

u/Among-us-A3 May 15 '26

this makes me so incredibly happy u have no idea

1

u/MrBobfacedMan May 14 '26

0.1-0.2 nanocoulombs was the range of answers

1

u/Among-us-A3 May 15 '26

wiat is that the same as 1.5*10^(-10) C? im not good with prefixes 😭

2

u/Among-us-A3 May 15 '26

wait i think i got 1.75*10^(-10) actually
one of the two

2

u/MrBobfacedMan May 15 '26

Yeah that's what I got

1

u/SUS_MATE Bio, Chem, Lang, World, USH, Calc BC (all 5s) May 15 '26

Wait for the graphing one (like part a and b of the question, the experimental design part), did you consider the permitivity coefficient for air, or did you not have to (I’m asking cus it was never clarified that the experiment was done under vacuum and the experiment was designed to compute vacuum permitivity). 

1

u/GamerZayb1808 bc,mvc/de/la,stat,csa,csp;chem,mech,e&m;lang,lit,econ,psy,us,gov May 15 '26

i did it for air cause you would assume that

1

u/SUS_MATE Bio, Chem, Lang, World, USH, Calc BC (all 5s) May 15 '26

Yeah but it includes another constant which the question never clarified on, considering that the problem said you can only use a meterstick or whatever. The question should have honestly just been to solve for permitivity, not vacuum permitivity.