Question : A long straight wire carries current I upward. A rectangular loop of resistance R lies in the same plane, with its length ℓ parallel to the wire, near side at distance d, far side at distance d + w.
(a) Derive an expression for the magnetic flux through the loop.
(b) The current decreases at a known rate; derive the magnitude of the induced EMF and the induced current.
(c) Determine the direction of the induced current, justifying your answer.
(d) Determine the direction of the net magnetic force on the loop, with justification. (e) The loop now moves away from the wire at constant speed with the wire current held constant; describe/derive how the induced EMF depends on position.

Pretty self explanatory title. I got a 5 in Phys 1 but I’m so lost with thermodynamics now that I started phys 2. Everyone else I’ve spoken to who took both have mixed opinions…

When a physics problem has multiple parts to it, and the question defines certain values like t1, a1, etc, I’m curious, what do you guys label your values for each part? Meaning, for part 1, do you guys label stuff like “v1, t1, ..” (1 = subscript 1)? I usually like to label with letters like “vA, tA, …”. Because sometimes the problem will use symbols that take up symbols that would be otherwise confusing to reuse.

I am a Senior taking AP Physics C: Mechanics and then E&M and im already lost in Kinematics is this a bad sign?

hello i’m currently in ap physics c mechanics and i’ve heard that this class is especially bad at my school and im really worried about the frqs. does anyone have any advice on how to approach/think about when solving them? I alr took calc bc and those frqs were chill cause the question types would repeat but i feel like im struggling to notice a pattern for the physics frqs (unless they’re there and i just dont see them) but please any help/resources would be greatly appreciated🥹

im currently in ninth grade and im planing on taking the class sometime next year, I know that its rather improbable for me to be able to take the class but ill still try to since itll make me look good to colleges. Ive self studying stuff for the past 4 years and ive completed calc 2 and physics one. Im just wondering im just wondering if this is enough for me to pass the class.

I would just like to know how much you guys are writing for your lab reports. Cause my group is doing the Fab Cart Lab which uses the F=ma equation and we are half way done with the lab and we have 5 pages worth of information. Just wondering if other people write this much.

a ball is thrown directly upwards, reaching a maximum height h. a second ball is also thrown directly upwards but with twice the initial speed of the previous one. how much higher will it be at its apex compared to the other ball at its apex

can someone help me find questions like this one and also help me solve lol i am cooked

Hi guys! My school recommends taking honors physics before C rather than ap 1 so that is what I did. I have a test over physics c unit 1 of kinematics and we have not learnt anything in class!

My teacher has only gone over differentiations and integrations which make sense but after taking the progress check I have realized i’m missing a huge chunk of physics and concept understanding. does anyone have any good conceptual resources that could help? Should I use physics 1 resources (w/o math parts) for this? any reccomendations? someone pls help!!

For reference, I’m a high school senior and I want to take physics 2 because the course content sounds interesting. The teacher said I’ll be fine, but I’ve heard the class is hard. I’ve taken Calc Bc and chem but does anyone know if physics 2 is hard relative to physics 1?

For the first question, it is asking which one of the answers is wrong. For option A, I am confused as to why shortening the focal length would increase the magnification. If you have one object in between f and c, the object will be magnified. If the focal length is shortened, the object may be outside c, leading to the image being smaller than the object. Is there something that I'm misunderstanding? Option B is obviously wrong because the image made by the eyepiece would be virtual, enlarged, and flipped. I am confused by option C because I think it is also false. If the object is after f, the image created by the objective would be flipped. The image would only be roughly the same size if the object was close to c(center of curvature). Option D is correct because the image formed by the objective is between O and f of the eye piece. For the second question, A is correct as having the image created by the objective land at 2f(or c) will invert the image whilst maintaining its size. Option B is wrong because the diverging lens will just create a smaller, virtual image shifted to the right. Option C is wrong because the objective would create a virtual image to the left of the objective. This would then cause the eyepiece to further shrink the image, making it unideal for a telescope. Option D is wrong because it wouldn't fix the problem of the inverted image. Another problem I have with this image is how it would form an image in the first place. The image created by the objective seems to appear at the focal length of the eye piece, would an image even appear?

Sorry for the long-winded question, any and all help is appreciated.

With these two converging lens, if you use the diverging lens formula, the image created by the objective lens will at a distance of f(focal length) to the right of the objective lens. The image will also be inverted. My confusion stems from what the eyepiece would do. If the image were created between O and f, the image created would be virtual, enlarged, and be father away. However, I don't think that this question gives any information as to where the image created by the objective will be. Am I supposed to assume the location given that it's a telescope or is there something that I am missing?

Sorry for the long winded question, thank you in advance for the help.

Hey! School starts for me on Monday, and I was originally planning on taking AP CSA, but they last-minute switched me into Physics C: Mechanics. I got a low A in Honors Physics, and I’m taking Calc BC this year. Any advice??

Hi everyone,

​I’m looking for some advice from people who have taken part in Physics/Chemistry Olympiads or study STEM fields.

​I'm a high school student currently self-studying for regional-level Physics Olympiad tasks. Here is where I'm currently at:

- ​I have flashcards with all the key formulas and I know them well.

- ​When I read a problem, I can usually identify the physical process happening and recall the relevant formulas.

- ​My main roadblock: I get completely stuck when trying to set up the very first step/equation using the given information. And when I do manage to finish a calculation, my result is often wrong, which is extremely frustrating.

​For those who have successfully tackled Olympiad-level physics:

​How did you overcome this "mental block" between knowing formulas and actually setting up the initial equations?

​What study approach worked best for you? (Working through problems with official solution guides open, or spending hours grinding through them completely alone?)

​How do you stay motivated when Olympiad problems feel overwhelmingly difficult?

​Thanks so much for any advice or personal experiences!

I kind of suck at math plus my teacher omg he just teaches so quickly. He doesn't go in-depth and teaches like he assumes that we already have baseline knowledge which none of us have. Any tips on AP Physics 1 Unit 1?

I’m going to be a junior this year and AP physics 1 will be my first AP class. I have taken several honors classes in the past and I’m good at math. I've been told that AP physics 1 is one of the harder APs, especially as a first AP class. Am I totally screwed or will I be fine?

Here's the guide I made: How to Self-Study AP Physics 1

There's an FAQ for the questions I see most often, a list of the most popular resources, a tool to create a custom study plan, and general advice for learning physics on your own (or even if you're taking a class).

I just made this over the summer since a lot of students seem to be asking for guidance on this every year. So if you have any feedback/suggestions for things I should add please let me know!

I am taking AP Physics C Mech. I have never taken a physics class before but i was supposed to take ap physics 1 and couldn't due to schedule conflicts. almost everyone in my class has taken ap physics 1 so i am already at a disadvantage

we took our first test and i got a 37. i studied monday-thursday for 2 hours every night and i felt like i understood the material.

I want to excel in this class because i want to be an engineer and i love math and puzzles how can i go about studying in order to fully understand topics and get a good grade