The earth's magnetic field lines resemble that of a dipole at the centre of the earth

PHYSICS · Single correct · CBSE · Physics · Magnetism and Matter · Magnetism and Matter

Problem

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 \times 10^{22} \text{ Am}^2

, the value of earth's magnetic field near the equator is close to (radius of the earth =

6.4 \times 10^6 \text{ m}

) (1) 0.6 Gauss (2) 1.2 Gauss (3) 1.8 Gauss (4) 0.32 Gauss