# Search results

1. ### This magnet question confounds me

Homework Statement Today, my teacher gave us some practice AP multiple choice and my friend and I were debating between answer choices H and J (changed from A and B to remove any confusion) the question as i remember it: blah blah... B-field into the page, constant velocity v, radius R and...
2. ### Need help with gauss law and charged ring AP Physics FRQ

Homework Statement 1. 2. Homework Equations ∫E.dA = Qenc/\epsilon_{o} \lambda=Q/L \rho=Q/V V= q/4πε_{o}r The Attempt at a Solution these types of problems i suck at, i dont know how to do these at all independently, and is there any difference in question 2 if there is an insulator or...
3. ### Schools What should i expect in physics in college?

First off, sorry for wrong location of post. I am wondering what kind of stuff you guys do in college physics. Is it similar to AP Physics? What should I expect in the Biochemistry Major, I was looking at the suggested courses on my future college's website and I think it was something like Gen...
4. ### Current in a rectangle on a hinge

Homework Statement Figure 29-36 shows a rectangular, 15-turn coil of wire, 10 cm by 5.0 cm. It carries a current of 0.90 A and is hinged along one long side. It is mounted in the xy plane, at an angle of 30° to the direction of a uniform magnetic field of 0.50 T. Find the magnitude and...
5. ### Circuit help - resistors and batteries in a network

circuit help -- resistors and batteries in a network Homework Statement (a) Calculate the current through each ideal battery in Fig. 28-41. (As a sign convention, assume the currents are "up" through each battery.) A (I1) A (I2) A (I3) Assume that R1 = 1.5 , R2 = 2.5 ...
6. ### Electric potential of tiny spheres question

Homework Statement Two tiny metal spheres A and B of mass mA = 3.40 g and mB = 3.90 g have equal positive charges q = 4.50 µC. The spheres are connected by a massless nonconducting string of length d = 1.00 m, a distance that is much greater than the radii of the spheres. (a) What is the...
7. ### Why does the E-field inside a cylinder =0?

Homework Statement Figure 24-32 shows a section of a long, thin-walled metal tube of radius R, carrying a charge per unit length  on its surface. Derive expressions for E in terms of distance R from the tube axis, considering both (a) r > R and (b) r < R. Plot your results for the r = 0 to...