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  4. A coil of metal wire is kept stationary in a non-uniform magnetic field

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Q. A coil of metal wire is kept stationary in a non-uniform magnetic field

AMUAMU 2009

Solution:

When a coil made of copper wire is placed inside a magnetic field, magnetic flux is linked with the coil.
Faraday found that when the magnetic flux linked with the coil is changed, an electric current starts flowing in the coil, provided the coil is a closed one.
The change in magnetic flux linked with a coil may be caused by varying the strength of magnetic field or by the relative motion between the source of magnetic field and the coil. The induced current and the emf in the coil last only so long as the magnetic flux linked with the coil keeps on changing.