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The magnetic force on a charge q moving with velocity v in magnetic field B is:
AF = q v · B
BF = q B
CF = q v × B
DF = q (v + B)
Answer & Solution
Correct answer: C. F = q v × B
1. Lorentz magnetic force: F = q v × B (cross product).
2. Magnitude: F = q v B sinθ. Maximum at θ = 90°, zero when v ∥ B.
3. Direction by right-hand rule. Force is ⊥ to both v and B.
_Source: NCERT Class 12 Physics Ch 4 §4.2 Magnetic Force_
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