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How is mutual inductance of a pair of co...

How is mutual inductance of a pair of coils affected when (i) separation between the coils in increased, (ii) the number of turns of each coil is increased , (iii) a thin iron sheet is placed between the two coils, other factors ramaining the same ? Explain your answer in each case.

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(i) On increasing distance between the two coils, magnetic flux passing from one coil to the other decreases. Therefore, mutual inductance decreases
(ii) When an iron sheet is placed between the two coils, mutual inductance increases because `M prop mu` (permeability).
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