How is the mutual inductance of a pair of coils affected when
(i) the separation between the coils is increased,
(ii) the number of turns of each coil is increased, and
(iii) a thin iron sheet is placed between the two coils, other factors remaining the same? Explain your answer in each case.
(i) the separation between the coils is increased,
(ii) the number of turns of each coil is increased, and
(iii) a thin iron sheet is placed between the two coils, other factors remaining the same? Explain your answer in each case.
Answer: (i) M decreases;
(ii) M increases;
(iii) M increases.
Solution
Mutual inductance depends on how effectively the flux of one coil links the other.
(i) Increasing the separation reduces the flux of the primary that threads the secondary, so decreases.
(ii) Since , increasing the number of turns in each coil increases .
(iii) A thin iron sheet (high permeability) concentrates and guides the flux from one coil to the other, improving the linkage, so increases.
(i) Increasing the separation reduces the flux of the primary that threads the secondary, so decreases.
(ii) Since , increasing the number of turns in each coil increases .
(iii) A thin iron sheet (high permeability) concentrates and guides the flux from one coil to the other, improving the linkage, so increases.
CBSE Class 12 Board · 2006 · Subjective