A wire loop with an area of 0.020 m2 isperpendicular to a uniform magnetic field of 0.30 T.

If the field drops to zero in45 ms, what is the average induced emf in the loop?

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Irving HeathcoteLv2

18 Feb 2019

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An emf is induced in a conducting loop of wire 1.36 m long as itsshape is changed from square tocircular. Find the average magnitudeof the induced emf if thechange in shape occurs in 4.29 s, andthelocal 0.121 T magnetic field isperpendicular to the plane of theloop.

if someone can help me with this problem, i would appreciate it.

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Your response differs from the correct answerby orders ofmagnitude. mV

A magnetic field is passing through a loop of wire whose area is0.020 m2. The direction of the magnetic field is parallel to thenormal to the loop, and the magnitude of the field is increasing atthe rate of 0.19 T/s.
(a) Determine the magnitude of the emf induced in the loop.(V)

(b) Suppose that the area of the loop can be enlarged orshrunk. If the magnetic field is increasing as in part (a), at whatrate (in m2/s) should the area be changed at the instant when B =1.6 T if the induced emf is to be zero? (Give the magnitude of therate of change of the area.) (m2/s)

Explain whether the area is to be enlarged or shrunk.