PhysicsNEET 2019Force on a moving charge and on a current

Moving Charges and Magnetism

Ionised hydrogen atoms and $α$ -particles with the same momenta enter a constant magnetic field $B$ at right angles to it. The ratio of the radii of their circular paths $r_{H} : r_{α}$ will be:

A. $2 : 1$ ✓
B. $1 : 2$
C. $4 : 1$
D. $1 : 4$

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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From Physics › Moving Charges and Magnetism › Force on a moving charge and on a current — lectures, notes and every past question on it.

Last revised 7 Sept 2026. Found a mistake? Tell us — corrections are the fastest thing we act on.

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