Q5.2Multiple choice
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,
- (a)the declination varies between 11.3° W to 11.3° E.
- (b)the least declination is 0°. Magnetism and Matter
- (c)the plane defined by dipole axis and Earth axis passes through Greenwich.
- (d)declination averaged over Earth must be always negative.