How is the mutual inductance of a pair of coils affected when:
(i) separation between the coils is increased?
(ii) the number of turns of each coil is increased?
(iii) A thin iron sheet is placed between the two coils, other factors remaining the same? Explain your answer in each case.
(i) When seperation between the coils is increased, mutual inductance (M) decreases because the measure of flux linking to a coil due to the other one will decrease.
(ii) When the number of turns of each coil is increased, mutual inductance (M) increases because the overall flux density increases with increase in turns of the coil and, hence the mutual inductance increases.
(iii) When a thin iron sheet is placed betweent the two coils, M increases because iron is ferromagnetic in nature hence, it will increase the flux density.
