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Q & A

Q.  The net charge in a current carrying conductor is zero, even then it experiences force in magnetic field, why?
 
A. Magnetic force depends not only on the charge but also on the velocity.  The positive charges inside the conductor have zero drift velocity and hence they do not experience any force.  Whereas, the negative charges, i.e. the electrons have non-zero drift velocity when they carry current and hence they experience force.

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