Question
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A circular loop of wire of resistance R = 0.500 Ω and radius
r = 8.00 cm is in a uniform magnetic field directed out of the
page as in Figure P20.54. If a clockwise current of I = 2.50
mA is induced in the loop, (a) is the magnetic field increasing
or decreasing in time? (b) Find the rate at which the field is
changing with time.

check_circle

Step 1

The clockwise induced current in the loop produces a flux which is directed into the page through the area enclosed by the loop.

Since the flux generated in the circular loop opposes the change in flux due to the external magnetic field, the outward directed flux due to the external filed must be increasing in magnitude. Hence, the magnitude of the external field itself must be increasing in time.

Step 2

b).

Formula to calculate the emf induc...

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