The force experienced by a pole of strength 100 Am at a distance of 0.2 m from a short magnet of length 5 cm and pole strength of 200 Am on its axial line will be

Options

A. `5xx10^(-2)N`
B. `2.5 xx10^(-2)N`
C. `3.5xx10^(-4)N`
D. `5xx10^(-4) N`

Answer

A

Explanation

`F=(mu_(0))/(4pi)(M_(1)m_(2))/(r)^(2)=(10^(-7)xx100xx200)/(4xx10^(2))`
`5xx10^(-2)N`