Questions in Moving Charges and Magnetism

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	A proton, a deuteron and an $\alpha - $particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If ${r_p},\,{r_d}$ and ${r_\alpha }$ denote respectively the radii of the trajectories of these particles, then
	When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their
	A charge moves in a circle perpendicular to a magnetic field. The time period of revolution is independent of
	A proton of energy 200 MeV enters the magnetic field of 5 T. If direction of field is from south to north and motion is upward, the force acting on it will be
	An electron enters a region where magnetic (B) and electric (E) fields are mutually perpendicular to one another, then
	A charge moving with velocity v in X-direction is subjected to a field of magnetic induction in the negative X-direction. As a result, the charge will
	An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then
	A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
	A particle moving in a magnetic field increases its velocity, then its radius of the circle
	A particle is moving in a uniform magnetic field, then