2 When a bar magnet is moved through a stationary wire coil

2

When a bar magnet is moved through a stationary wire coil, an electric current flows through the wire. What kind of force is most directly responsible for making current flow around the coil? an electric force a magnetic force both of the above neither of the above When a wire coll is moved over a stationary bar magnet, an electric current flows through the wire. In this case, what kind of force is most directly responsible for making current flow around the coil? an electric force a magnetic force both of the above neither of the above

Solution

When a magnet is moved through a conducting coil, a net emf is induced in the coil which pushes the electrons around the conductor. The electrons in turn produces a current which again has a magnetic field opposing the motion of the magnet being pushed. Hence in the primary force causing the electrons to flow in this case is electric.

However, when a coil is moved in presence of a magnet, the electrons are moved in presence of a magnetic field, which causes them to suffer a force given as F = qV x B.

Hence, the primary force in this case is magnetic.