(a)[2]
A small electric component in a circuit must be shielded from a strong external magnetic field. Describe how this is carried out and state any material used.
(b(i))[3]
In the space provided, sketch a simple electromagnet.
(b(ii))[3]
State and describe in detail one application of an electromagnet.
(c(i))[3]
Explain what is observed on the ammeter when a student slowly inserts the N-pole of a bar magnet into the right-hand end of the solenoid.
(c(ii))[1]
Explain what is observed on the ammeter when the student keeps the bar magnet stationary in the solenoid.
(c(iii))[3]
Explain what is observed on the ammeter when the student quickly withdraws the N-pole of the magnet from the right-hand end of the solenoid.