A magnet of pole strength m and length l is broken into two pieces. The pole strength of each piece is _________

Question

anonymous · Answer

@experimentX

anonymous · Answer

Options
a) m    
 
b)m/2   
 
c) 2m    
 
d)m/4

experimentx · Answer

I don't know the answer to be exact.
let's try to think it in terms of current.|dw:1336268902939:dw|

anonymous · Answer

LOL.  I have the answer with me.  It is m/2  . But I don't know why.  Is there any formula for magnetic pole strength. Because I don't seem to find one.  Moreover I have only 20 minutes to leave for my exam centre and this is one of the sample questions

anonymous · Answer

Any logic you would apply.   I found only One formula which is 
m = pl
m-->magnetic moment
p-->pole strength
l--->separation of charges.
According to this I should get 2m but don't know why answer is given as m/2

experimentx · Answer

I was guessing the same. If we remove the two loops above ... the field would reduce by 2