Answer:

Induced emf: the emf developed in a coil to change in magnetic flux

linked with the coil is called the induced emf.

Faraday's Law Electromagnetic Induction: On the basis of experiments, Faraday

gave two laws of electromagnetic induction:

(i) When the magnetic flux linked with a coil changes, an emf is induced in the coil. If coil closed, the current is also induced. The emf and current last so long as the change in magnetic flux lasts. The magnitude of induced emf is proportional to the rate of change of magnetic flux linked with the circuit. Thus if △φ is the change in magnetic flux linked in time △t then rate of change of flux is

△t/△φSo emf induced ε∝ △t/△φ

2. The emf induced in the coil (or circuit) opposes the cause producing it.

ε∝− △t/△φHere the negative sign shows that the induced emf ε opposes the change in magnetic flux.ε=−K △t/△φ

where K is a constant of proportionality which depends on units chosen for φ, t and ε. In SI system the unit of flux φ, t is weber, unit of time t SECOND and unit of emf ε is volt and K=1

∴ε=− △t/△φ

... (i)

If the coil contains N− TURNS of insulated wire, then the flux linked with each turn will be the same and the emf induced in each turn will be in the same direction, hence the EMFs of all turn will be added. Therefore the emf induced in the whole coil,ε=−N

△t/△φ

... (ii)

Nφ is called the effective flux or the number of flux linkages in the coil

and may be denoted by φ

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