Physics (AS & A Level) · May / June 2016 · Paper 43 · Question 10
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10(a)[4]
(non-uniform) magnetic flux in core is changing induces (different) e.m.f. in (different parts of) the core (eddy) currents form in the core which give rise to heating [4]
10(b)[5]
as magnet falls, tube cuts magnetic flux e.m.f./(eddy) currents induced in metal/aluminium (tube) (eddy) current heating of tube with energy taken from falling magnet or (eddy) currents produce magnetic field (M1) that opposes motion of magnet (A1) so magnet B has acceleration < g or magnet B has smaller acceleration/reaches terminal speed [5]
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