First slide
Faraday's law of Electromagnetic induction
Question

If the radius of a coil is changing at the rate 10-2 units in a normal magnetic field 10-3 units, the induced emf is 1 μV. What is the final radius of the coil ?

Moderate
Solution

e= e=dϕdte= BdAdRdRdt  !0-6= 10-3(2πR)(10-2) R= 1.6cm 

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