. A moving coil galvanometer experience torque = ki where I is current. If N coils of area A each and moment of inertia I is kept in magnetic field B.

(i)          find k in terms of given parameters,

             (ii)   if for current i deflection is , find out torsional constant of spring.

             (iii)  if a charge Q is passed suddenly through the galvanometer, find out maximum angle of deflection.