Two identical magnets with a length `10cm` and weights `50gf` each are arragned freely with their like poles facing in a vertical glass tube. The upper magnet hangs in air above the lower one so that the distance between the nearest poles of the magnets is `3mm`. Determine the pole strength of the poles of these magnets.

Options

A. `6.64 amp xx m`
B. 2 amp `xx` m
C. 10.25 amp `xx m`
D. None of these

Answer

A

Explanation

`F_(m)= mg`
`rArr (mu_(0))/(4pi).(q_(m)^(2))/(r^(2))= 50 xx 10^(-3) xx 9.8`
`rArr q_(m)= 6.64A m`