Answer: 10 A.
- A 0.4 A
- B 10 A
- C 2.5 A
- D 5 A
Correct answer: B. 10 A
Explanation: For an ideal transformer, VpIp = VsIs and Vs/Vp = Ns/Np = 5. Hence Ip = 5 × 2 = 10 A.
As a magnet approaches a coil, flux rises steadily and a constant non-zero EMF is induced (Faraday's law). Once the magnet stops moving, flux stays constant and the induced EMF drops to zero - EMF only exists while flux is actively changing.
Concept context
Faraday's and Lenz's laws, motional EMF, self/mutual inductance, eddy currents, and the AC generator - how a changing magnetic flux creates an electric current.