Home › UP Board Class 12 › Physics › Moving Charges and Magnetism › A charge q moves with velocity v through a regio…
A 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: NCERT Class 12 Physics Ch 4 "Moving Charges and Magnetism", §4.2.2_
Related questions
An electron and a proton enter a magnetic field with the same kinetic energy, perpendiculaA galvanometer is converted into an ammeter of higher range by connecting:The work done by a static magnetic force on a moving charge is:Magnetic field at a point on the axis of a circular loop, far from the loop (distance x ≫ The dimensional formula of the magnetic field B (in SI units of tesla) is:A cyclotron of magnetic field B accelerates positive charges of mass m, charge q. The cyclTorque on a magnetic dipole (current loop) of moment m placed in a uniform field B at anglTwo long parallel wires carry currents I₁ and I₂ in the SAME direction, separated by dista