A charge \( q \) is moving with a velocity \( v \) parallel to a magnetic field \( B \). Force o...

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A charge \( q \) is moving with a velocity \( v \) parallel to a magnetic field \( B \). Force on the charge due to magnetic field is
(a) \( q v B \)
(b) \( q B / v \)
(c) zero
(d) \( B v / q \)
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