The ratio of magnetic induction at a point along the axis of a circular coil of radius a at a distance x to a point where x tends to zero is `[x gt gt a]`

Options

A. `x^(3)//a^(3)`
B. `a^(3)//x^(3)`
C. `2a^(3)//x^(3)`
D. `2x^(3)//a^(3)`

Answer

B