P7 - Magnetism and Electromagnetism Mark Scheme

Wed, 19 Aug 2026 12:14:08 +0700

Magnetism and Electromagnetism - Marking Scheme

This is the marking scheme for quiz: P7 - Magnetism and Electromagnetism Quiz
Topic guide: P7 - Magnetism and Electromagnetism

Forces and poles repel
- Correct answer: A (Both magnets have the same pole facing each other)
- Reason: Like poles (N-N or S-S) repel. Opposite poles (N-S) attract.
Transformer turns ratio
- Correct answer: A (Ns > Np)
- Reason: Step-up transformer: V_s > V_p when N_s > N_p.
Electromagnet with switch

Wed, 19 Aug 2026 12:11:34 +0700

Two permanent magnets are placed close together. They begin to push away from each other. Which is true?
A) Both magnets have the same pole facing each other
B) One magnet is north and the other is south
C) The magnets have the same strength
D) The field lines are crossing
A transformer changes the alternating voltage. If the secondary voltage is higher than the primary voltage, what is the turn ratio?
A) Ns > Np
B) Np > Ns
C) Np = Ns
D) The transformer does not work