An electron, moving in a uniform magnetic field of induction of intensity `vecB` has its radius directly proportional to

In case of a uniform magnetic field, the lines of magnetic induction are

A particle carrying a charge moves perpendicular to a uniform magnetic field of induction B with a momentum p then the radius of the circular path is

An electron of mass 'm' charge e enters into a uniform magnetic field region of induction B and is found to describe a circle of radius r. The magnetic field induction B can be calculated from the equaiton

A uniform electric and a uniform magnetic field are pointing in the vertically downward direction. An electron moves vertically downwards through them. The electron :

A long solenoid has a radius a and number of turns per unit length is n . If it carries a current i, then the magnetic field on its axis is directly proportional to