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Physics · May / June 2021 · Paper 41 · Question 7

0625

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The question as text

Fig. 7.1 represents an alternating current (a.c.) generator. N S X Y H direction of rotation Fig. 7.1

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  • 7(a)(i)[3]

    any three from:

    y-axis labelled e.m.f. and x-axis labelled time
    at least one cycle of a sinusoidal wave
    only two complete cycles of a sinusoidal wave
    constant amplitude and constant period for first two periods of a sinusoidal wave

  • 7(a)(ii)[1]

    peak or trough or corresponding time labelled P

  • 7(a)(iii)[2]

    (amplitude / maximum e.m.f.) increases

    (e.m.f.) changes direction more often or greater frequency

  • 7(b)[3]

    alternating current in primary coil

    alternating / changing magnetic field

    or magnetic field cuts secondary coil (continuously)

    (alternating) e.m.f. induced in the secondary coil

  • 7(c)[2]

    smaller current (and same resistance when the power is transmitted and an equal rate)

    less thermal energy loss / produced (in cables)

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