Q. 4

The free electrons in a conducting wire are in constant thermal motion. If such a wire, carrying no current, is placed in a magnetic field, is there a magnetic force on each free electron? Is there a magnetic force on the wire?

Answer :

Formula used: The magnetic force is given by



Where F is magnetic force


I is current


L is length of the wire


B is magnetic field


If the electron is in motion definitely there will be a magnetic force on it. Electrons are present in conducting wire. But current flowing in the wire is zero. When this wire is placed in a magnetic field the electrons will come to motion but the motion will be random. So we can neglect the effect of force on each electron. So total magnetic force acting on the wire will be zero.


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