## PHYS208 Fundamentals of Physics II

### Answer for Ch. 31, 39P

a)
Taking the time derivative of the expression below leads to an induced emf of 0.24 mV
for the parameters stated in problem description.

b) The induced current is 0.60 mA clockwise.

c) Thermal power generated is 0.144 microW.

d) The external agent must apply a force of 28.7 nanoN.

e) Same power as part c).

Thanks to Andrew Towle and Jim Durbano for reporting the previous
error in the order of magnitude in part d).

"http://www.physics.udel.edu/~watson/phys208/exercises/answers/31-39P.html"

Last updated Nov. 9, 1997.

Copyright George Watson, Univ. of Delaware, 1997.