Answer :

Given:


Emf of the battery = ϵ


Length of sliding wire = l


Resistance = r


Magnetic field = B


Velocity = v


Formula used:


(a) Induced emf … (i), where B = magnetic field, l = length of sliding wire, v = velocity


Therefore, net emf =


Hence, current in the wire(Ans)


(b) Magnetic force acting on the wire … (ii), where i = current, l = length of sliding wire, B = magnetic field.


Hence, from (a),


Therefore, force (Ans)


(c) At constant velocity, net force will be 0.


Hence, = 0



Hence, value of velocity = (Ans)


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