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If the current in the primary circuit of...

If the current in the primary circuit of a pair of coils changes from 5 A to 1 A in 0.02 s.
Calculate (i) induced emf in the secondary coil if the mutal inductance between the two coills is 0.5 H and
(ii) the change of flux per turn in the secondary ,if it has 200 turns .

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