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Question

A particle of mass in and charge Q moving with velocity v enters a region of uniform magnetic field of induction B. Its path in the region is

A
Straight line
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B
Circular, it v×B=0
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C
Circular, if v.B=0
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D
Parabolic
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Solution

The correct option is C Circular, if v.B=0
When v is perpendicular to B, path is circular, hence vB=0.

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