(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The plane of a 20cm x 20cm metal loop with a mass of 10g and a resistance of 0.010 ohms is oriented vertically. A 1.0 T horizontal magnetic field, perpendicular to the loop, fills the top half of the loop. There is no magnetic field through the bottom half of the loop. The loop is released from rest and allowed to fall.

a) Show that the loop reaches a terminal velocity and find a value for the terminal velocity.

b) How long will it take the loop to leave the field? Assume that the time needed to reach the terminal velocity is negligible. How does this compare to the time it would take the loop to fall the same distance in the absence of a field?

2. Relevant equations

terminal velocity equation = sqrt. (4mg/A)

magnetic flux = A B cos(theta)

I = V/R

I'm not sure if I need other equations....

3. The attempt at a solution

I tried finding the magnetic flux, and I got 0.02 Wb. I know that the initial velocity of the loop is 0 m/s. I am also wondering if there would be some sort of force upward to resist the movement of the loop downward, so that maybe the speed of the loop is slowed somewhat during falling.

Any help would be greatly appreciated, as I am really stuck on how to answer this questions.

Thanks!

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# Homework Help: Loop released from rest and allowing to fall.

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