Why do magnetic poles always occur in north-south pairs?

[jayjay112]

Magnetic poles (A simple question but I don't know how to answer it?)

(i)Show the magnetic field associated with the earth,

(ii)and use your diagram to explain
why magnetic poles always occur in north south pairs




I don't know how to go about the second part at all!?/

 

[tiny-tim]

Hi jayjay112!

Hint: draw a different planet, with an electric field, and draw the electric field round it.

What is the difference between that and your diagram of the magnetic field?

How can the second planet get away without having an opposite "electric pole"?