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 zero. Then,
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A
Since the axis of the magnetic dipole placed at the center of earth makes an angle of 
with the axis of earth the two possibilities arise as shown in above figure. Hence the declination varies between 
to 
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