Question

# A short bar Magnet with its north pole facing North forms a neutral point P in the horizontal plane. If the magnet is rotated by 900 in the horizontal plane, the net magnetic induction at P is:(Horizontal component of earths magnetic field is BH)

A
0
B
2BH
C
52BH
D
5BH
Solution
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#### At P, the equatorial field due to magnet =BH.After rotation, P lies on the axis of the bar magnet.Hence, at P, field due to magnet =2BHNet field is the vector sum of BH and 2BH, both at right angles to each other giving, Bnet=√5BH

0
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