a) Obtain the expression for the deflecting torque acting on the current carrying rectangular coil of a Galvanometer in a uniform magnetic field. Why is a radial magnetic field employed in the moving coil galvanometer? b) Particles of mass `1.6 xx 10^(-27)` kg and charge `1.6 xx 10^(-19)` C are accelerated in a cyclotron of dee radius 40 cm. It employs a magnetic field of 0.4 T. Find the kinetic energy (in MeV) of the particle beam imparted by the accelerator.