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The magnetic field of the earth can be m...

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 the axis of the earth. At mumbai, declination is nearlyzero, then.

A

the plane defined by dipole axis and axis passes through greenwich

B

declination averaged over earth must be always negative

C

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

D

at least declination is `0^(@)` .

Text Solution

Verified by Experts

The correct Answer is:
C
The dipole axis (S-N) can be on either side of `N_(g), - N_(s)` , line. Accordingly the declination varies,
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