a electron is moving in magnetic field.why its kinetic energy is constant in magnetic field

Asked by  | 11th Sep, 2012, 01:32: AM

Expert Answer:

Not in every magnetic field...here you are talking about electron entering the mag field in perpendicular direction.
In that case the force on the electron will be max and=qvB
and the electron will move in circular motion...rather uniform circular motion as there is no other force acting.
In uniform circular motion the speed is uniform . So its KE will also be same through out.
In ideal case it will dissipate due to friction.

Answered by  | 12th Sep, 2012, 12:23: PM

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