A coil is wound as a transformer of rectangular cross section. If all the linear dimension of the transformer are increased by a factor `2` and the number of turns per unit length of the coil remain the same, the self-inductance increased by a factor ofA. `16`B. `12`C. `8`D. `4`

A coil is wound as a transformer of rectangular cross section. If all

1.	A coil is wound as a transformer of rectangular cross section. If all the linear dimension of the transformer are increased by a factor `2` and the number of turns per unit length of the coil remain the same, the self-inductance increased by a factor ofA. `16`B. `12`C. `8`D. `4`
Answer» Correct Answer - C Self-inductance `L=mu_(0)N^(2)A//l=mu_(0)n^(2)lA` where `n` is the number of turns per unit length and `N` is the total number of turns and `N=nl` In the given question `n` is same. `A` is increased `4` times and `l` is increased `2` times and hence `L` will be increased `8` times.

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A coil is wound as a transformer of rectangular cross section. If all the linear dimension of the transformer are increased by a factor `2` and the number of turns per unit length of the coil remain the same, the self-inductance increased by a factor ofA. `16`B. `12`C. `8`D. `4`

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