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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Radius of a circular ring is changing with time and the coil is placed in uniform magnetic field perpendicular to its plane. The variation of ‘r’ with time ‘t’ is shown in Fig. Then induced emf e with time t will be best represented by

Radius of a circular ring is changing with time and the coil is placed in uniform magnetic field perpendicular to its plane. The variation of ‘r’ with time ‘t’ is shown in Fig. Then induced emf e with time t will be best represented by

In a region at a distance r from z axis magnetic field B = B0rtk is present where B0 is constant and t is time. Then the magnitude of induced electric field at a distance r from z axis is given by