Question

describe briefly one way of producing an induced emf

Answer 1

Emf induced by changing the magnetic induction 2. Emf induced by changing the area enclosed by the coil 3. Emf induced by changing the orientation of the coil

Answer 2

resently, there are six known methods for producing a voltage or electromotive force (emf). Some of these methods are more widely used than others, and some are used mostly for specific applications. Following is a list of the six known methods of producing a voltage.
1. FRICTION - Voltage produced by rubbing certain materials together.
2. PRESSURE (piezoelectricity) - Voltage produced by squeezing crystals of certain substances.
3. HEAT (thermoelectricity) - Voltage produced by heating the joint (junction) where two unlike metals are joined.
4. LIGHT (photoelectricity) - Voltage produced by light striking photosensitive (light sensitive) substances.
5. CHEMICAL ACTION - Voltage produced by chemical reaction in a battery cell.
6. MAGNETISM - Voltage produced in a conductor when the conductor moves through a magnetic field, or a magnetic field moves through the conductor in such a manner as to cut the magnetic lines of force of the field.