A) how does the mutual inductance of a pair of coil change when: (i) the distance between the coils is increased? (iii) a thin iron sheet is placed between the two coils, other factors remaining the same? Justify your answer in each case.
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i) When the separation between the two coils is increased, the flux linked with the secondary due to the current in the primary, decreases. Hence the mutual inductance decreases.
(ii) Mutual inductance increases when the number of turns in each coil is increased, because
M is directly proportiontal to N1N2.
(iii) When an iron sheet is placed between the two coils the mutual inductance increases, because
M is directly proportiontal to permeability.
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