The magnetic field of the earth can be modelled by that of a point dipole placed at the centre of the earth…

Q: The magnetic field of the earth can be modelled by that of a point dipole placed at the centre of the earth. The dipole axis makes an angle of 11.3° with axis of the earth. At Mumbai, declination is nearly zero. Then,

(a) The declination varies between 11.3° W to 11.3°E

(b) The least declination is 0°

(c) The plane defined by dipole axis and the earth axis passes through Greenwich

(d) Declination averaged over the earth must be always negative

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Ans: (a)