The expected answers were:
- Faraday’s Law of electromagnetism states that whenever magnetic flux linked with a circuit changes, an emf is always induced in the circuit.
OR If there is a relative motion between a conductor and a magnetic field, an emf is induced in the conductor.
- (i) l = 0.4 m; v = 10 m/s; i = 10 A; B = 0.5 T
F = Bil = 0.5 x 0.4 x 10 = 2 N
(ii) Induced emf, E = Blv
= 0.5 x 0.4 x 10 = 2 V
(iii) Power dissipated, P = Blv x i
= 0.5 x 0.4 x 10 x 10 = 20 W
The question was on Electromagnetic Field. The question was unpopular with the candidates. The candidates were reported to show shallow knowledge of this topic.