Physics (AS & A Level) · Oct / Nov 2016 · Paper 42 · Question 11
9702
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11(a)[2]
(induced) e.m.f. proportional/equal to rate of change of (magnetic) flux (linkage) [2]
11(b)[3]
(for same current) iron core gives large(r) (rates of change of) flux (linkage) e.m.f induced in solenoid is greater (for same current) induced e.m.f. opposes applied e.m.f. so current smaller/acts to reduce current [3]
or same supply so same induced e.m.f. balancing it (B1) (rate of change of) flux linkage is same (M1) smaller current for same flux when core present (A1)
11(c)[2]
e.g. (heating due to) eddy currents in core (heating due to current in) resistance of coils hysteresis losses/losses due to changing magnetic field in core Any two of the above marking points, 1 mark each [2]
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