Physics · Oct / Nov 2021 · Paper 21 · Question 7
5054
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7(either)(a)[3]
magnetic field lines cut the solenoid / coils or changing magnetic field in solenoid an electromotive force / e.m.f. is induced electromotive force / e.m.f. produces the current
7(either)(b)[2]
negative / opposite / reversed current / deflection / reading negative e.m.f. / voltage (induced) or magnetic field cut in opposite direction or magnetic field changes in opposite sense / decreases (owtte)
7(or)(a)[1]
NOR (gate)
7(or)(b)(i)[1]
lower logic gate has an input of logic level 1 (and so its output / Y is 0) or the output X has a logic level 1 and so the inputs must both be 0 (Y is an input to the upper NOR gate)
7(or)(b)(ii)[1]
X changes to 0 and Y changes to 1.
7(or)(b)(iii)[1]
both X and Y stay at the new values or neither X nor Y changes
7(or)(b)(iv)[1]
the output shows which terminal (P or Q) last had the value 1.
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