Answer :

As this sign suggest that the direction of magnetic field is outwardly along z-axis. Also in above figure circular plane is in x-y plane and in question given that .

So now area vector is also in i.e. same as and area is πa2 thus the angle now substituting the values




Now applying faraday’s law,



So


Now this induced e.m.f also produced induced current



We have to find the current at t, t , t putting these values in above equation


Therefore current at



and direction will be along + ĵ


Now current at



Hence current at


I=0


Now at last current at




Hence magnitude of current at



and direction will be along - ĵ


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