Question

A coil is made of an insulated copper wire and current is passed through the coil. Now, two magnets are kept at each end of the coil with the polarity as shown in the figure below.
If the magnets do not move, will there be any change in the length of the coil ? what will happen on reversing the direction of current ?

Answer 1

Direction of M.F. due to a current carrying conductor. Relation between thickness of the wire and strength of the current Relation between strength of the current and strength of the magnetic field