At some location on earth the horizontal component of earth\'s magnetic field is `18 xx 10^(-6)T`.
Channel: Doubtnut
Date: 2020-01-03

At some location on earth the horizontal component of earth\'s magnetic field is `18 xx 10^(-6)T`. At this location, magnetic needle of length 0.12m and pole strength 1.8 Am is supended from its mid-point using a thread, it makes `45^(@)` angle with horizontal in equilibrium. To keep this needle horizontal, th evertical force that should be applied at one of its ends is