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The magnetic field at a point on the mag...

The magnetic field at a point on the magnetic equator is found to be `3*1xx10^-5T`. Taking the earth's radius to be `6400km`, calculate the magnetic moment of the assumed dipole at the earth's centre.

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The correct Answer is:
`8*1xx10^(22)Am^2`
A point on magnetic equator is in broadside-on position of the earth's assumed dipole. Therefore,
`B=(mu_0)/(4pi)M/d^3`
or `M=(Bd^3)/(mu_0//4pi)`
`:. M=(3*1xx10^-5(6*4xx10^6)^3)/(10^-7)`
`=8*1xx10^(22)Am^2`
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PRADEEP-MAGNETIC EFFECT OF CURRENT AND MAGNETISM-Exercise
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