The newest 20 of 119 written questions. Open one to see it on the real paper.
Calculate the electromotive force (e.m.f.) FE, induced across XY when the frame is moving at its maximum speed.
See it on the paper →On Figure 6.3, sketch the variation of the induced e.m.f. E across XY with t between t=O andt=2T. Ey E 0 0 T 2T -E, Figure 6.3
See it on the paper →State Faraday’s law of electromagnetic induction.
See it on the paper →Calculate the magnetic flux cut by the wings of the aircraft in a time of 15 s. Give a unit with your answer. magnetic flux = unit
See it on the paper →Determine the area of flux cut by the wings in a time of 15 s. area = m 2
See it on the paper →Use your answer in (b)(ii) to determine the speed v of the aircraft. v = m s –1
See it on the paper →Use Lenz’s law of electromagnetic induction to explain which of the wingtips P and Q is at the higher induced potential.
See it on the paper →State Faraday’s law of electromagnetic induction.
See it on the paper →Calculate the magnetic flux cut by the wings of the aircraft in a time of 15 s. Give a unit with your answer. magnetic flux = unit
See it on the paper →Determine the area of flux cut by the wings in a time of 15 s. area = m 2
See it on the paper →Use your answer in (b)(ii) to determine the speed v of the aircraft. v = m s –1
See it on the paper →Use Lenz’s law of electromagnetic induction to explain which of the wingtips P and Q is at the higher induced potential.
See it on the paper →l S Fig. 1.1 An alternating voltage is applied to the terminals. The peak value of the alternating voltage is E and the frequency is f. The peak value of the potential difference V across the resistor is determined using an oscilloscope. It is suggested that V is related to f by the relationship ES KAN 2 f = V l where...
See it on the paper →l S Fig. 1.1 An alternating voltage is applied to the terminals. The peak value of the alternating voltage is E and the frequency is f. The peak value of the potential difference V across the resistor is determined using an oscilloscope. It is suggested that V is related to f by the relationship ES KAN 2 f = V l where...
See it on the paper →State Faraday’s law of electromagnetic induction.
See it on the paper →Explain how Fig. 7.2 shows that E is proportional to the velocity v of the rod.
See it on the paper →Use Faraday’s law to show that the variation of E with time t is given by E = Blat where a is the acceleration of the rod.
See it on the paper →The length of the rod is 0.45 m. The acceleration a of the rod is 7.8 m s –2 . Determine the value of B. B = T
See it on the paper →State Lenz’s law of electromagnetic induction.
See it on the paper →induced e.m.f. = V Determine the magnitude of the electromotive force (e.m.f.) induced across spoke AX.
See it on the paper →Comprehensive responses • Candidates obtained the correct answer. Limited responses • Candidates usually knew the starting equation E = BA / t. • Most candidates applied the unit conversion factor to the 6.0 cm value correctly. • Candidates often incorrectly used the area of the rectangular coil for the value for A. • Some candidates did almost everything correctly, though needed to realise that...
— Examiner report, February/March 2026, 9702/42 Q6(c)(i) (Cambridge)
Comprehensive responses • Candidates showed well-drawn sinusoidal curves of the correct period, amplitude and phase. Limited responses • Candidates often drew sinusoidal curves of the correct period and frequency. • Many candidates drew a sine curve rather than a cosine curve without realising that the phase is determined by maximum e.m.f. when the flux is being cut at the greatest rate. • Some c...
— Examiner report, February/March 2026, 9702/42 Q6(c)(ii) (Cambridge)
Faraday’s law of electromagnetic induction was generally well-known, and full credit was common.
— Examiner report, February/March 2025, 9702/42 Q7(a) (Cambridge)
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