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  4. A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with a velocity pointed in the same direction. Then the electron will

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Q. A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with a velocity pointed in the same direction. Then the electron will

KEAMKEAM 2007Moving Charges and Magnetism

Solution:

As electron is moving parallel to both the fields, so magnetic force does not affect the electrons motion. But electric force $ (qE) $ acts opposite to motion of electron. Hence, electron will not be deflected but its speed decreases.