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The magnetic field of Earth can be model...

The magnetic field of 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 the axis of Earth. At Mumbai, declination is nearly can zero. Then,

A

(a) the declination varies between `11.3^@ W` to `11.3^@E`

B

(b) the least declination is `0^@`.

C

(c) the plane defined by dipole axis and Earth axis passes through Greenwich.

D

(d) declination averaged over Earth must be always negative.

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