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?
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1. it decreases since flux linked with both the coils decreases
2. it increases with number of turns in each coil
3. it increases since magnetic permiability increases
mutual induction formula
M=magnetic permiability*n1*n2*A*l
where
n1=number of turns in coil 1
n2=number of turns in coil 2
A=area of cross section coil
l=length of the coil
hope this helps
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