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Question

Assertion :The energy of a charged particle moving in a uniform magnetic field does not change. Reason: Work done by the magnetic field on a charge particle is zero.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The force on a charged particle moving in a uniform magnetic field always acts in the direction perpendicular to the direction of motion of the charge. As work done by a magnetic field on the charge is zero,[W=FScosΘ], so the energy of the charged particle does not change.

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