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 ?

1. Decrease in mutual induction2.increase in no. Of turns will bring increase in M (M is proportional to product of number of coils of two coils)3.M inc because relative permaebilty inc

1 when the seperation is increased the mutual inductance decreases because the flux passing from one coil to other decreases.2 M is proportional to N1N2So when the no. Of turns is increased the mutual inductance also increases.3 when an iron sheet is placed between the coils the mutual inductance increases.M is proportional to permeability.!