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

The speed of the electron will increase

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The speed of the electron will decrease

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The speed of the electron will remain the same

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The velocity of the electron will remain the same.

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Solution

The correct option is C The speed of the electron will remain the same
Force acts perpendicular to the velocity in a magnetic field, so speed of electron will remain same.
Hence ,Option $C$ is correct.

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

The correct option is C The speed of the electron will remain the sameForce acts perpendicular to the velocity in a magnetic field, so speed of electron will remain same.Hence ,Option C is correct.

The correct option is C The speed of the electron will remain the same
Force acts perpendicular to the velocity in a magnetic field, so speed of electron will remain same.
Hence ,Option $C$ is correct.