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Ananya Shree

Class 12th
Physics
2 years ago

The earth’s field, it is claimed, roughly approximates the field due to a dipole of the magnetic moment 8 × 1022 JT-1 located at its centre. Check the order of magnitude of this number in some way.

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Muskan Anand

2 years ago

The magnetic field at a point on the equatorial line of the ,agnetic dipole (earth as a magnetic dipole) is given by, B=4πμ0​​×r3M​ M=8×1022JY−1 r=6.4×106m ∴B=10−7×(6.4×106)38×1022​=0.3×10−4T=0.3G It is really of the order of the observed field of earth

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