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Nuclear sizes are expressed in a unit named

Magnetism at the centre of a bar magnet is

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muskan13
the first one is fermi and the other one is zero 
hope this helps
HolmesNWatson
Nuclear size are measured in a unit called fermi
Magnetism at the centre of a bar magnet is zero, because there is no magnetism at all in the centre
Hope this helps :) 

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