First slide

Magnetic flux and induced emf

Question

In an induction coil, the secondary e.m.f. is

Moderate

A

Zero during break of the circuit
B

Very high during make of the circuit
C

Zero during make of the circuit
D

Very high during break of the circuit

Solution

In induction coil, current dies out and iron core is demagnetized and rate of withdrawal of flux becomes very large at the time of break and consequently large emf is induced in the secondary.

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