Potential due to magnetic dipole at distance from centre of the dipole on axis of dipole is V.What will be potential at distance 2r from centre on the axis of dipole?

Options

A. V/2
B. V/4
C. 2V
D. 4V

Answer

B

Explanation

`r_(1)=r,r_(2)=2r,V_(1)=V,V_(2)=?`
`Voo(1)/(r^(2))`
`(V_(2))/(V_(1))=((r^(1))/(r^(2)))^(2)`
`V_(2)=((r)/(2r))^(2) V_(1)=(V)/(4)`