Recent content by physninj

I just read in my book the following statement "the magnetic force acting on a charged particle can never do work because at every instant the force is perpendicular to the velocity" So the work is zero like I said.

Thanks so much for your response 1. There is no NET force, if I understand the question statement correctly, because the velocity is constant. No acceleration means no force. I know that the magnetic force is not zero. 2. I know that work=force*distance, I did a search for a vector formula but...

Homework Statement a proton moves with a velocity <6*105,3*105> m/s through a magnetic field given by <.2,.2> T a. Find the magnetic force per unit charge on the proton b. Find the work done by this forceHomework Equations Fm=qv x BThe Attempt at a Solution For part a, I used a property of...

I see, because what's not dissipated by the resistor is stored in the capacitor. I think I will take that route. So its just Pemf-Presistor=Pcapacitor My other equations look alright I'm assuming?Thanks a bunch.

Homework Statement A simple RC circuit with an EMF source ε, Resistor R and capacitor C are in series. When the switch is closed find the rate of energy stored in the capacitor, the power dissipated in the resistor, and the power supplied by the emf as functions of time. Homework Equations...

YES! Thank you so much! I see now that the current through the capacitor's branch is just I45+I67 and they otherwise behave like normal independant circuits. It could potentially be easier to solve that way. I'll give it a go, the first time was just practice. Thank you everyone.

I got it with the KCL's. Yeah I don't agree with you. Whatever your method is, it's just giving me a headache. Just finding the effective resistance doesn't give you the voltage across the resistor, for R3 for example. You keep saying the fact that there are two batteries doesn't matter, It does...

I think my way worked fine, the voltage divided by the total resistance in the bottom loop works out the same way, Is that what you are getting at? I kind of forgot about that equation. I simulated it and 3/13 is right, I just thought about it and now i see its just the voltage over the...

You've all been helpful, but I'm not sure where to go now. Ehild I studied up on Thevenin's theorem because it hasn't been covered in my class. Here is my latest work. Starting with the lower loop I think I got I67! ε3-I67R6-I67R6=0 ε3/(R6+R7)=I67 =3/13 A I don't know what to do next, I...

Thank you both for your swift replies. The voltage across the cap is 0. It looks like I've been making things harder then they need to be, which is my specialty. That is a huge relief. Can't believe I wrote out an 8*9 matrix for this :P Now I see that I2 has to equal I1 and likewise for I6...

Homework Statement For the multi-loop circuit as shown, assuming the capacitor is initially uncharged, find the currents in each of the resistors at t=0 after the switches are closed. So I believe there are 8 unknowns really because of the 8th branch with the capacitor. If you look at the...

Good catch, I appreciate that. It's potential energy per unit charge, and even that applies to a test charge not a capacitor if I'm understanding correctly. So using my new understanding of the E-field being the slope pointing towards lower potential I have: 1. F if the electric field is...

That first answer came straight out of my understanding of the textbook so if that is wrong for some reason then I am back at square one. I'm sorry but I'm frustrated, I don't understand how my nose can be in my textbook and still not be able to figure these problems out. Why would there be a...

Homework Statement 1. If the electric field is zero at a point, the potential must also be zero at that point 2. If the electric potential is zero in some region of space, then the electric field must also be zero in that region. 3. If the electric field is zero in some region of...

Homework Statement two very long coaxial cylinders. Inner has radius a and is solid with charge per unit length of λ. Volume is also uniform but not defined by a parameter. Outer is hollow with inner radius b and outer radius c. Outer cylinder is a conductor with charge per unit length of -2λ...