alleryA charge q moves with velocity v through a region with electric field E and magnetic field B. The net electromagnetic force on it is
Aq(E + v × B)
Bq(E + v · B)
Cq(E - v × B)
Dq · v · B + q · E²
Answer & Solution
Correct answer: A. q(E + v × B)
1. The total electromagnetic force on a moving charge is the Lorentz force.
2. The electric contribution is qE; the magnetic contribution is q(v × B).
3. Sum: F = qE + q(v × B) = q(E + v × B).
4. This single expression covers both static and moving frames in non-relativistic electromagnetism.
_Source: syllabus Physics Ch 4 "Moving Charges and Magnetism", §4.2.2_
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