In: Physics
The length of the bar magnet 4cm, if we cut into half
the right half will have same poles.
Cutting the bar magnet in half produces two weaker but still
complete magnets, each with a north pole and a south pole. No
matter how small magnets are cut, even down to microscopic size,
each piece remains a complete magnet with two poles.
So always magnets pair of poles. there is no existence of
unipole.
Therefore the option is (A)