What is point dipole?...

What is point dipole?

Verified by Experts

If `"lim"_(2a to 0) q to infty` and `q to 0` in `vecp = 2vecqp`, then the electric dipole is called a point dipole.

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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,

the declination varies between 11.3° W to 11.3° E.

the least declination is 0°.

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

declination averaged over Earth must be always negative.