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Kinetic Energy

An electron m...

Question

An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y direction. Which of the following physical quantity (ies) is (are) non-zero and remain constant?

A

Velocity of the electron

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B

Magnitude of the momentum of the electron

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C

Force on the electron

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D

The kinetic energy of electron

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Solution

The correct option is D
The kinetic energy of electron

Velocity and force changes due to change in direction but magnitude of momentum and KE of electron remain constant as speed is constant

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