What does “Magnetic force on a moving charge” actually mean in Moving Charges & Magnetism, and why does it matter for JEE?
A charge moving in magnetic field feels q(v x B). The force is perpendicular to both velocity and field, so a magnetic field changes direction of motion but does no work and cannot change speed by itself.
In simple words: A charge moving in magnetic field feels q(v x B). The force is perpendicular to both velocity and field, so a magnetic field changes direction of motion but does no work and cannot change speed by itself. Getting Magnetic force on a moving charge clear matters because JEE questions on Moving Charges & Magnetism usually test this idea directly, not just a formula you memorised.
Key point
Magnetic force on a moving charge
Common mistake
using qvB when velocity is parallel to the field.
Memory tip
only the perpendicular velocity component bends.
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