First slide

Force on a charged particle moving in a magnetic field

Question

An electron enters a magnetic field whose direction is perpendicular to the velocity of the electron. Then

Easy

A

The speed of the electron will increase
B

The speed of the electron will decrease
C

The speed of the electron will remain the same
D

The velocity of the electron will remain the same

Solution

Force acts perpendicular to the velocity in a magnetic field, so speed of electron will remain the same.Since trajectory of the electron is circular , its velocity changes.

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