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Question

A charge particle is released from rest in a region of steady and 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
Force on charge q due to the electric field ¯E,¯F1=q¯E
Force due to the magnetic field ¯B,¯F2=q¯vׯB
=qvB sin 0
= 0
Net force on the charge q, ¯F=¯F1+¯F2=q¯E+0=q¯E
Thus the charged particle will move in a straight line
Hence the correct answer is option 1.

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