The expected answers were:
(a) (i) Self inductance - is the property of a coil (inductor) which makes it to oppose changes in current or flux through it.
E = L dI
dt
(ii) Mutual inductance - is the ability of one coil (circuit) to produce emf in a nearby coil (by induction) due to changes in the current
(of flux) in the first coil.
The applications of the electromagnetic induction are:
- electric bell,
- buzzer.
- relays,
- loudspeaker
- transformer
- motor.
This question was on electromagnetic induction. The question was attempted by
many candidates.
The recall of self and mutual inductances were such a herculean task to many
candidates.
The concept being tested in part(b) was understood by the majority while the applications were correctly listed.
