A rectangular coil is placed in a region...

A rectangular coil is placed in a region having a uniform magnetic field `B` perpendicular to the plane of the coil. An emf will not be induced ion the coil if the

magnetic field is increased uniformly

magnetic field is switched off

coil is rotated about an axis XX'

coil is rotated about an axis perpendicular to the plane of the coil and passing through its centre O

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