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The force on a charge q moving with velocity v in a magnetic field B (Lorentz magnetic force) is
AF = q(v × B), vector cross product
BF = qE only, independent of B
CF = qB / v
DF = q(v · B), scalar product
Answer & Solution
Correct answer: A. F = q(v × B), vector cross product
Lorentz magnetic force F = q(v × B) — perpendicular to both v and B, magnitude qvB sinθ.
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