Recent content by palaphys

sorry, long time but I feel I've tried enough. not getting how to proceed. trying to use V=Q/C

the correct answer is for voltage at t=0+ is -E.

also, to be precise the source is a Youtube video, which uses the incorrect polarity. thanks for pointing that out.

I think I have found my mistake. In this charging equation, I had to substitute ##i_{s.s} ## as -E/(2R) and not just E/2R . (As the steady state current in the inductor is upward, as opposed to the initial current which is downward.) Have I identified my mistake correctly?(I'm getting the...

I think there is some misunderstanding here. My original question posted here was a part of a larger question, which is the one described above in the previous message.

okay let me post the larger part of the question here. this was the original circuit. I am required to find the voltage across the inductor after S2 is closed at t=0+, given that initially S1 was closed for a long time, so as to establish an initial current ## i_0= E/R## through the inductor...

In this seemingly simple circuit, applying KCL, I get the current in the shorted branch as ## 3E/(2R) - 2E/(2R) = E/(2R) ## but some sources suggest that it is ##5E/ (2R) ## which is right and why?

let me try this

This is the diagram given for the problem. Now I was able to identify, that the fact that the capacitance of a spherical capacitor, with one plate and the other at an infinite distance, is somehow to be used in this problem, i.e ##C= 4\pi\epsilon_0R ## IF I can replace all the spherical...

ok that makes sense. but I have a question. IF there was no external torque (hypothetical) then is it valid to conserve momentum as I have said?

I have another question: If angular momentum is conserved, then it would be conserved in all directions. But in the horizontal direction, the initial angular momentum is zero, and the final angular momentum is non zero (## L_{aboutcm}## of the vertical disc). Why is this? Am I right in the first...

Consider the diagram shown above. I came up with two ideas to solve this: i) I do not see any external torques about the vertical axis in this problem. so, angular momentum is conserved about this axis. (is it?) ii)the standard way, that is, writing newton's second law for rotation, and applying...

so are you implying, that the value of F I got using force balance, IS a valid value for some a force to get the block moving? but it's not the maximum value. Did I get you right?

but when velocity is maximum, there is a momentary equilibrium, isn't it? this means forces at that point of time will be balanced. is it not?

why is this? why not the eqb. position?