JEE Main 20178 Apr, Morning shiftPhysicsMediumElectromagnetic Induction and Alternating Currents149× since 2002
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 = I_o cos (t). The emf induced in the smaller inner loop is nearly :