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At some location on earth the horizontal...

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

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