Magnetism and Electromagnetism

Magnetism and Electromagnetism - Marking Scheme This is the marking scheme for quiz: P7 - Magnetism and Electromagnetism Quiz Topic guide: P7 - Magnetism and Electromagnetism Multiple Choice uestions (3 × 3 marks = 9 marks) 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 ...

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 ...