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Helical Motion

The following...

Question

The following cases in which no force is exerted by a magnetic field on a charge is

A

moving with constant velocity

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B

moving in a circle

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C

at rest

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D

moving along a curved path

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Solution

The correct option is C at rest
$F_{B} = q (\to v \times \to B)$
if $v = 0, F_{B} = 0$

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