Physics · Work, Energy and Power
An electron and a proton move under the influence of their mutual electrostatic and magnetic forces. In calculating the change in the total kinetic energy of the system during motion, the magnetic force of one particle on the other is ignored. Why is this correct?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The two magnetic forces are equal and opposite, so they produce no net effect.
- 2The magnetic force on a charged particle is always perpendicular to its velocity, so it does no work.✓
- 3The magnetic forces do equal and opposite non-zero work on each particle, canceling out.
- 4The magnetic forces are always negligible in magnitude compared to electrostatic forces.
Correct answer
The magnetic force on a charged particle is always perpendicular to its velocity, so it does no work.
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