Magnetism and ElectromagnetismAQA GCSE Physics (8463)

Induced Potential, Transformers and the National Grid

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

Practice progress

5 MCQs

0 of 5 attempted

Correct

Incorrect

Remaining

1
A bar magnet is held stationary inside a coil connected to a galvanometer. The galvanometer reads:
Answer & explanation
Correct: option C
Induction requires a changing magnetic field. A stationary magnet produces a constant field → no induced current.
2
Which of the following would NOT increase the induced p.d. when a magnet is pushed into a coil?
Answer & explanation
Correct: option D
Thicker wire reduces resistance and so increases the induced CURRENT for a given p.d., but does not change the induced p.d. itself.
3
The N pole of a magnet is pushed into a coil and a current is induced. The near end of the coil:
Answer & explanation
Correct: option B
The induced current's magnetic field opposes the change. To oppose the incoming N pole, the near end of the coil must become N (repelling it).
4
A magnet is dropped through a copper tube. The magnet falls more slowly than expected because:
Answer & explanation
Correct: option B
Lenz's law: induced currents in the copper produce a magnetic field that opposes the magnet's motion, slowing it down.
5
Which of these is NOT an application of the generator effect?
Answer & explanation
Correct: option C
A loudspeaker uses the MOTOR effect (current produces force on the coil). The other three use the generator effect (motion produces an induced p.d.).

Magnetism and ElectromagnetismAQA GCSE Physics (8463)

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

5 MCQs

0 of 5 attempted

Correct

Incorrect

Remaining

1
A bar magnet is held stationary inside a coil connected to a galvanometer. The galvanometer reads:
Answer & explanation
Correct: option C
Induction requires a changing magnetic field. A stationary magnet produces a constant field → no induced current.
2
Which of the following would NOT increase the induced p.d. when a magnet is pushed into a coil?
Answer & explanation
Correct: option D
Thicker wire reduces resistance and so increases the induced CURRENT for a given p.d., but does not change the induced p.d. itself.
3
The N pole of a magnet is pushed into a coil and a current is induced. The near end of the coil:
Answer & explanation
Correct: option B
The induced current's magnetic field opposes the change. To oppose the incoming N pole, the near end of the coil must become N (repelling it).
4
A magnet is dropped through a copper tube. The magnet falls more slowly than expected because:
Answer & explanation
Correct: option B
Lenz's law: induced currents in the copper produce a magnetic field that opposes the magnet's motion, slowing it down.
5
Which of these is NOT an application of the generator effect?
Answer & explanation
Correct: option C
A loudspeaker uses the MOTOR effect (current produces force on the coil). The other three use the generator effect (motion produces an induced p.d.).