A bar magnet is 10 cm long is kept with ...

A bar magnet is 10 cm long is kept with its north (N) pole pointing north. A neutral point is formed at a distance of 15 cm from each pole. Given the horizontal component of earth's field is 0.4 Gauss, the pole strength of the magnet is

`7.44"ampere"xx "metre"`

`77.4"ab-ampere" xx cm`

`18.5"ampere" xx "metre"`

`185"ab-ampere" xx cm`

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