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A bar magnet when placed at an angle of to the direction of magnetic field induction of experiences a couple . If the length of the magnet is 5 cm, its pole strength is
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Correct option is A
τ=MBsinθ⇒τ=(mL)Bsinθ⇒25 x 10-6=(m x 5 x 10-2) x 5 x 10-2 x sin30o⇒m=2 x 10-2 Am
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The magnetic needle of a tangent galvanometer is deflected at an angle .The horizontal component of earth's magnetic field is along the plane of the coil. The magnetic induction produced by the coil at its center is
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