Question

The magnetic induction at a point P on the axis is equal to the magnetic induction at a point Q on the equator of a short magnetic dipole. What is the ratio of the distances of P and Q from the centre of the dipole?
A. `1.26:1`
B. `12.6:1`
C. `2:1`
D. `1.62:1`

Answer 1

Correct Answer - A
`B_("axis")=B_(eq)`
`(mu_(0))/(4pi)2M/(r_(e)^(3))`
`therefore(r_(s)/r_(e))=3sqrt((2)/(1))=(1.26)/(1)`