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How can the direction of force on a current -carrying conductor ,kept in a magnetic field ,be changed ?
A current carrying conductor has a magnetic field associated with it.The two magnetic fields,one due to the magnet and the other due to the current in the conductor,interact.This produces a force on the conductor.
The direction of the magnetic force depends on 
(a) the strength of electric current,and
b) the strength of the magnetic field.


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