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Question

A charge q is moving with a velocity v parallel to a magnetic field B. Force on the charge due to magnetic field is
qvB
Zero
Bv/q
qB/v

A

qvB

B

qB/v

C

Zero

D

Bv/q

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Solution

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$F + q (\to V \times \to B)$
$\to V | | \to B, θ = 0$
$F = 0$

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