Recent content by hopkinmn

Also, for this different circuit, suppose the switch has been closed for a long time and then reopened. Upon reopening, the currents through the three resistors would be V/Rx, where x is 1, 2, or 3. After the switch has been opened for a long time, does the inductor act as the battery for the...

So then as time goes to infinity, does the current through the inductor go to zero?

Homework Statement I'm having trouble understanding how RL circuits work. Here's my understanding so far. Let me know where I'm going wrong. I've provided a reference image. Right after the switch is closed, the current through R1 and R2 is zero. The potential difference for these two...

Homework Statement A circular conducting loop with radius a and resistance R2 is concentric with a circular conducting loop with radius b much greater than a and resistance R1. A Resistance dependent voltage is applied to the larger loop, having a slow sinusoidal variation in time given by...

Ok, I see now, thank you

But is there a way to find that variable in terms of just R?

So I'm still confused how to find the "original" Req. To find the "new" Req, would you set it up so the old Req and the resistor in the rung are in parallel? And then add the two R.

If you added one more, then the Req would just stay the same, since there's already an infinite amount.

If you added another ladder stage, wouldn't the Req just increase? Also, I'm not sure I understand what you meant by : So if the rungs were in parallel, there wouldn't be any resistors in the legs (above the first rung)?

Ok, I understand it now, thanks so much!

Homework Statement Identical resistors, R, make up the legs and rungs of a resistive ladder of infinite height. Find Req (equivalent resistance) of ladder, measured between points A and B. Homework Equations The Attempt at a Solution Here's my thought process: First make all...

So I set up the expression P(t)=V(t)^2/R3, where V(t)=V*e^(-t/(R3*C)) When I integrate this expression, I get E(t)=-.5*V^2*C*e^(-2t/(R3*C)) Since the switch has just been opened, t=0. I then get E(0)=-.5*V^2*C But this just gives me the same answer for part B, where I found energy stored in...

Homework Statement The problem first asks to find potential difference across the capacitor after the switch has been closed a long time. Then it asks to determine the energy stored in a capacitor when the switch has been closed for a long time. I got both these answers right, with...

Oops, yes, you are right! Thanks!

No, I guess not. Thanks for helping me work this out!