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The earth's magnetic field at the equator is approximately 0.4 G. Estimate the earth's dipole moment. |
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Answer» Solution :The equatorial magnetic field is , `B_E=(mu_0m)/(4pir^3)` We are given that `B_B~0.4 G = 4 xx10^(-5)T.` For R, we take the earth `6.4xx10^6` m . Hence , `m=(4xx10^(-5)xx(6.4xx10^6)^3)/(mu_0//4pi)=4xx10^2xx(6.4xx10^6)^3""((mu_0)/(4pi)=10^(-7))` This is close to the value `8xx10^(22) Am^(-2)` as obtained in geomagnetic EXPERIMENTS . |
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