The earth-s field- it is claimed- roughly approximates the field due to a dipole of magnetic moment 8- 1022 J T1 located at its centre- Check the order of magnitude of this number in some way-

M #8722;8 #215;1022J/T #10; #10;R=6400rm #10; #10;=6.4 #215;106m #10; #10;Magnetic #10;field B= #956;04 #960;.Md3 #10; #10;=10 #87 ...

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Standard XII

Physics

Magnetic Moment

The earth's f...

Question

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.

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Solution

M−8×1022J/T

R=6400rm

=6.4×106m

Magnetic field B=μ04π.Md3

=10−7×8×0122(6.4×106)3

=0.31×10−4T

=0.31G

This value is same as that of earth magnetic field .

Answer : 0.31×10−4T

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The earth's field. it is claimed. roughly approximates the field due to a dipole of magnetic moment 8×1022JT1 located at its centre. Check the order of magnitude of this number in some way.

M−8×1022J/T R=6400rm =6.4×106m Magnetic field B=μ04π.Md3 =10−7×8×0122(6.4×106)3 =0.31×10−4T =0.31G This value is same as that of earth magnetic field . Answer : 0.31×10−4T

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.

M−8×1022J/T

R=6400rm

=6.4×106m

Magnetic field B=μ04π.Md3

=10−7×8×0122(6.4×106)3

=0.31×10−4T

=0.31G

This value is same as that of earth magnetic field .

Answer : 0.31×10−4T