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A small circular loop of wire of radius a is located at the centre of a much larger circular wire loop of radius b. The two loops are in the same plane. The outer loop of radius b carries an alternating current I=Iocos(ωt). The emf induced in the smaller inner loop is nearly :

(1)πμ0I02.a2bωsin(ωt)(2)πμ0I02.a2bωcos(ωt)(3)πμ0I0a2bωsin(ωt)(4)πμ0I0b2aωsin(ωt)

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