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Question

A charged particle is released from rest in a region of steady uniform electric and magnetic fields which are parallel to each other. The particle will move in a?

A
Straight line
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B
Circle
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C
Helix
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D
Cycloid
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Solution

The correct option is A Straight line

The charge will be unaffected by magnetic field as its velocity is collinear with the field. Thus magnetic force on charge will be zero. Electric field now can exert force along the same line therefore the path has to be linear.


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