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When electron beam passes through an electric field, they gain kinetic energy. If the same beam passes through magnetic field, then:

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Energy and momentum both remains unchanged

Their potential energy increases

Their energy increases

Their momentum increases

answer is D.

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Detailed Solution

Because magnetic force always points perpendicular to the particle velocity. That is why velocity remains unchanged thereby keeping energy $(\frac{1}{2} m v^{2})$ and momentum (mv) unchanged.

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