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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° E.

B

the least declination is 0°.

C

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

D

declination averaged over Earth must be always negative.

Text Solution

Verified by Experts

The correct Answer is:
A
The angle between magnetic meridian and geographic meridian is called magnetic declination.
Magnetic field obtain similar due to a hypothetical magnetic dipole located at the magnetic fields. centre of the earth.
This axis of dipole makes an angle of 11.3° to the axis of rotation of earth. As a result two possibilities arise as shown in the figure below.

So the declination varies from 11.3° (West) to 11.3° (East).
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