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An electron and a proton are moving under the influence of mutual forces. In calculating the change in the kinetic energy of the system during motion, one ignores the magnetic force of one on another. This is, because
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the magnetic forces do not work on each particle
When electron and proton are moving under influence of their mutual forces, then according to the flemings left hand rule, the direction of force acting on a charge particle is perpendicular to the direction of motion.
In magnetic field, work-done $=F_{.} s . \cos \theta$
$$
=F \text {. s. } \cos 90^{\circ}=0 \text {. }
$$
So magnetic forces do not work on moving charge particle.
In magnetic field, work-done $=F_{.} s . \cos \theta$
$$
=F \text {. s. } \cos 90^{\circ}=0 \text {. }
$$
So magnetic forces do not work on moving charge particle.
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