JEE Main 2017 Physics question
A small circular loop of wire of radius is located at the centre of a much larger circular wire loop of radius . The two loops are in the same plane. The outer loop of radius carries an alternating current . The emf induced in the smaller inner loop is nearly:
Answer: (4)
Solution
Because , the field of the outer loop is essentially uniform over the area of the inner loop and equal to its central value
B = .
The flux linked with the small loop is therefore
φ = B×π = ω t.
Faraday's law gives
ε = -
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