The magnetic field strength at a distanc...

The magnetic field strength at a distance 2m from a magnetic pole is`2xx10^(-7)`T.The pole strength of pole is

8AM

4Am

16Am

80Am

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The correct Answer is:

`r=2m,B=2xx10^(-7)T,m=?`
`B=(mu_(0))/(4pi)(m)/(r^(2))`
`2xx10^(-7)=(10^(-7)xxm)/(4)` m=8Am

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