A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 W is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (at), where A = 80 mT and a = 50p rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA
b. 18 mA
c. 14 mA
d. 22 mA
e. zero
Question 2
A square loop (length along one side = 20 cm) rotates in a constant magnetic field which has a magnitude of 2.0 T. At an instant when the angle between the field and the normal to the plane of the loop is equal to 20 and increasing at the rate of 10/s, what is the magnitude of the induced emf in the loop?
a. 13 mV
b. 0.27 V
c. 4.8 mV
d. 14 mV
e. 2.2 mV
Structure of a b turn
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