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The earth's magnetic field lines resemble that of a dipole at the centre of the earth. If the magnetic moment of this dipole is close to 8 10²² Am ^2 , the value of earth's magnetic field near the equator is close to (radius of the earth .=6.4 10^6 ~m )

Options

  1. A0.6 Gauss
  2. B1.2 Gauss
  3. C1.8 Gauss
  4. D0.32 Gauss

Correct answer

A. 0.6 Gauss

Step-by-step solution

Given M=8 10²² Am ^2 d = R _ e =6.4 10^6 ~m Earth's magnetic field, B = ₀ 4 2 M d ^3 aligned &= 4 10⁻⁷ 4 2 8 10²² (6.4 10^6 )^3 & 0.6 Gauss aligned

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