The pole strength of a 12cm long bar mag...

The pole strength of a 12cm long bar magnet is 20Am. The magnetic induction at a point 10cm away from the centre of the magnet on its axial line is

`1.1 xx 10^(-3) T `

`2 .2 xx 10^(-3) T `

`1.1 xx 10^(-2) T `

`2.2 xx 10^(-2) T `

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