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+1 vote
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How is the mutual inductance of a pair of coils affected when 

(i) Separation between the coils is increased? 

(ii) The number of turns in each coil is increased? 

(iii) A thin iron sheet is placed between the two coils, other factors remaining the same? Justify your answer in each case.

1 Answer

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by (44.7k points)
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Best answer

(i) Mutual inductance decreases. 

(ii) Mutual inductance increases.

(iii) Concept: (i) If distance between two coils is increased as shown in figure.

It causes decrease in magnetic flux linked with the coil C2. Hence induced emf in coil C2 decreases by relation Hence mutual inductance decreases.

(ii) From relation M21 = µ0 n1 n2 Al, if number of turns in one of the coils or both increases, means mutual inductance will increase.

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