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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 zero. Then,

A

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

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.

Text Solution

Verified by Experts

The correct Answer is:
C

Since the axis of the magnetic dipole at the center of earth makes an angle of `11.3^(@)` with the axis of earth, the two possible arise as shown in above figure, Hence, the declination varies between `11.3^(@)W "to" 11.3^(@)E`.
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