A bar of iron could be magnetised by unidirectional rubbing a permanent magnet rsquo-s pole on it- Take an iron sphere- divide it along diameters into 6 or more parts- and magnetise each piece- rubbing on a flat surface from the curved side to the inner vertex- So we rsquo-ve got a number of smaller magnets- with vertices being one pole and the curved surface another- Now through some means we recreate the original sphere- Is this a mono-pole magnet- -Magnetizer- highly powerful- magnetic power- constant-

No, #160;it #160;is #160;not #160;a #160;mono pole #160;spherical #160;magnet.No #160;matter #160;how #160;it #160;is #160;cut #160;an ...

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Standard VI

Physics

Losing Magnetism

A bar of iron...

Question

A bar of iron could be magnetised by unidirectional rubbing a permanent magnet’s pole on it. Take an iron sphere, divide it along diameters into 6 or more parts, and magnetise each piece: rubbing on a flat surface from the curved side to the inner vertex. So we’ve got a number of smaller magnets, with vertices being one pole and the curved surface another. Now through some means we recreate the original sphere. Is this a mono-pole magnet? (Magnetizer: highly powerful, magnetic power: constant)

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Solution

$N o, i t i s n o t a m o n o - p o l e s p h e r i c a l m a g n e t . N o m a t t e r h o w i t i s c u t a n d r e c r e a t e d, t h e r u b b e d s p h e r e w i l l h a v e t w o p l o e s, o n e a t t h e t o p a n d o t h e r a t t h e b o t t o m o f t h e s p h e r e . I t i s j u s t a s t h e c a s e o f t h e e a r t h' s m a g n e t i c p o l e s .$

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No, it is not a mono-pole spherical magnet.No matter how it is cut and recreated, the rubbed sphere will have two ploes , one at the top and other at the bottom of the sphere.It is just as the case of the earth's magnetic poles.