Q.

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

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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

answer is C.

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Detailed 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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