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Physics · May / June 2024 · Paper 42 · Question 7

0625

As printed in the paper

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  • 7(a)[4]

    (end of) one piece of steel brought close to (the end of) another piece owtte

    look to see if there is repulsion/attraction AND test between different ends/poles owtte

    any two from:

    repeat a valid test between the other pieces
    only magnets repel each other OR the pieces that repel are magnets
    attractions at both ends indicates one of them is unmagnetised

    OR the piece that only attracts is unmagnetised

    OR the piece that does not repel (at both ends) is unmagnetised

  • 7(b)(i)[3]

    0.19 A

    Ip Vp = Is Vs OR (Ip =) Is Vs / Vp OR (Ip =) 45 / 240 OR Ip Vp = 45 OR power in primary = power in secondary

    (Ip= ) 45 / 240

  • 7(b)(ii)[3]

    labelled diagram showing:

    (soft) iron core
    copper (coils)
    primary and secondary (coils) labelled AND fewer coils on secondary than on primary
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