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Analysis of Force Equation

Cathode rays ...

Question

Cathode rays gain K.E. when accelerated by an electric field. If they are subjected to a uniform magnetic field, then their

A

Energy increases

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B

Momentum increases

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C

Energy and momentum decrease

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D

Energy and magnitude of momentum remain
unaffected

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Solution

The correct option is D Energy and magnitude of momentum remain
unaffected
Zero work is done by magnetic field on a moving charged particle
Momentum changes but magnitude remains same

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