A thin, short wire of length in.nitely long, straight wire carrying 200 A and re

ID: 2109518 • Letter: A

Question

A thin, short wire of length

in.nitely long, straight wire carrying

200 A and resting on the .oor. The short wire is released from

rest and free falls, remaining parallel to the current-carrying wire as it descends. Derive an equation

for the emf induced in the short wire as a function of the fall time

t. Do it in the following two ways.

(a) Consider the rectangular region

S that is traced out by the short wire as it falls. Calculate the

magnetic .ux through

S at fall time t. Find the induced emf.

(b) Use the method of motional emf

a) Force on a moving conductor in a amagnetic field is

F=eV*B

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