Question

what are the reason for deflection in compass needle, when brought near bar magnet

Answer 1

Compass needle gets deflected in presence of bar magnet because it is made like that to reflect in presence of magnetism. It gets deflected on earth towards north also because of a huge magnetism of earth. ... A compasspoints towards the North Pole, which ismagnetic.

Answer 2

it gets deflected due to the magnetic field around the compass and the magnet