The magnetic dipole moment of a short magnetic dipole which produces magnetic potential of `4xx10^(-4) Wb//m` at axial point 2cm away from its centre is

Options

A. `1.0 Am^(2)`
B. `1.4 Am^(2)`
C. `1.2 Am^(2)`
D. `1.6 Am^(2)`

Answer

D

Explanation

`V=(mu_(0))/(4pi)(M)/(r^(2))`
`4xx10^(-4)=(10^(-7)xxM)/(4xx10^(-4)) therefore M=1.6 Am^(2)`