Recent content by Jaymo3141

that makes sense. thank you

well, I know that the force causing mv^2/r is kqq/r^2 coulombs law. And the proton is stationary so all the kenetic energy is from the electron. and I'm thinking that the energy of the electron can be calculated using work somehow since it is moving and there is a force on it. but the angle...

Homework Statement Homework Equations R=pL/A The Attempt at a Solution The answer is C and I don't know why. If R = pL/A then isn't L=b between X and Y?

Homework Statement (see attached) Homework Equations F=mv^2/r, Integral(F<dot>dl) The Attempt at a Solution the answer is B. Can anyone explain why?

don't you have to connect both leads to discharge a capacitor?

different charges? can a PPC have different charges on each plate. I don't think so. a must equal b. if one plate is +aQ then the other has to be -aQ. therefore your capacitance should be C=aQ/V

I'm looking for some really good an thorough multiple choice practice finals for my Electricity and Magnetism class. anyone have any recommendations? My goal is to get an A on this final and that is going to be very difficult so i need some really good practice. thank you for you help.

i'm having a hard time understanding why potential energy is 0 when u(mu) is perpendicular to B(mag field). Isn't the torque at max when the angle between u and B is 90? and there for has potential to do work all the way until the angle is 0. The way my mind sees it is, since there is a torque...

We are going over magnetism in my Physics 2 course but we barely covered electromagnets. I was wondering what the math equation for field strength would be for an electromagnet. In other words, how is current related to field strength when you wrap a wire around a piece of metal. Also I was...

Ok, I am starting to understand what voltage is. But I'm sort of confused when it comes to negative voltage. I know that voltage is defined as potential energy per unit charge. I understand it as analogous to "pressure". I don't understand what it means to have negative voltage though. How can...

so how is that useful? I'm really trying to give myself some context to all this new knowledge. I can calculate the capacitance and charge and do all the math but none it really means anything because I have no idea what these devices are really used for.

I'm taking electricity and magnetism at school and i we are learning about capacitors. I get how they work and what they do. However, i don't see how they're useful. What is their purpose other than storing energy? why not just have the battery supply the energy?