Questions
The radius of a coil decreases steadily at the rate of 10-2 m/s. A constant and uniform magnetic field of induction 10-3 Wb/m2 acts perpendicular to the plane of the coil. The radius of the coil when the induced emf in the coil is 1μV is :
detailed solution
Correct option is D
e=dϕdt=ddtπr2B=2πrBdrdt⇒r=e2πBdrdt ⇒r=10-62π x 10-3 x 10-2=5πcmTalk to our academic expert!
Similar Questions
A loop, having area 20cm2, is made of thin copper wire. If is placed in a uniform magnetic field of induction 1.5 Tesla with its plane perpendicular to the field. If area of the loop increases to 30 cm2 in 0.5 second, average emf induced in the loop is
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