Question

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
A. 2
B. 4
C. 6
D. 8

Answer 1

Correct Answer - D
Self inductance of solenoid,
`L=mu_(0)n^(2)Al`
`therefore LpropAlprop`(Linear dimension)
`therefore Lprop(2)^(3)=8`