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A unifrom magnetic field B is acting fr...

A unifrom magnetic field `B` is acting from south to north and is of magntitdue `1.5 Wb//m^(2)`. If a proton having mass `= 1.7xx10^(-27) kg` and charge `= 1.6xx10^(-19) C` moves in this field vertically downwards with energy `5 MeV`, then the force acting on it will be

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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.