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 of

Options

A. 16
B. 8
C. 4
D. 2

Answer

B

Explanation

As `L=(mu_(0)N^(2)A)/(l)`
`therefore Ato(2xx2xx4)/(2)` times=8 times