Motion of Charge in Magnetic Field

Class XII - Physics 

When an electron enters the magnetic field with velocity 'v'. Lorentz force acting on it is given by,

F = Bev SinѲ

When the velocity of electron is perpendicular to the magnetic field SinѲ = 1.

Therefore,
F= Bev

From Flemings's left hand rule, the Lorentz force is perpendicular to the direction of motion of electron. Although the direction of electron's motion varies the force is always perpendicular to it's motion. Hence, it follows a circular path where this Lorentz force provides the required amount of centripetal force.

Hence, we can write,


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