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  • The earth’s field, it is claimed, roughly approximates the field due to a dipole of magnetic moment 8 into 1022 J T minus 1 located at its centre. Check the order of magnitude of this number in some way.

5.1 e)  The earth’s field, it is claimed, roughly approximates the field due to a dipole of magnetic moment 8 \times 10 ^ { 22} J T ^{-1}located at its centre. Check the order of magnitude of this number in some way.

Answers (1)

Magnetic field 

B=\frac{\mu_o M}{4\pi R^3}

substituting the values 

R=6.4\times10^6\ m

\mu_0=4\pi \times 10^{-7}

M=8 \times 10 ^ { 22} J T ^{-1}

then

B=0.3G

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Safeer PP

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