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Question

The earth's magnetic field at the equator is approximately 0.4G. The earth's dipole moment is :
(Re=6.4×106m)
  1. 4×102Am2
  2. 1.05×1023Am2
  3. 4×105Am2
  4. 1.05×1020Am2

A
4×102Am2
B
4×105Am2
C
1.05×1020Am2
D
1.05×1023Am2
Solution
Verified by Toppr

The equatorial magnetic field is:
B=μ04πmr3
Given,
B=0.4G=0.4×104T
Radius of earth r=6.4×106m
m=Bμ04πr3=0.4×104107(6.4×106)3=104.9×1021=1.05×1023Am2

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