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A short magnetic needle is pivoted in a uniform magnetic field of induction $1T.$ Now, simultaneously another magnetic field of induction $\sqrt 3 T$ is applied at right angles to the first field; the needle deflects through an angle $\theta'$ whose value is :

\[\begin {array} {1 1} (1)\;30^{\circ} & \quad (2)\;45^{\circ} \\ (3)\;90^{\circ} & \quad (4)\;60^{\circ}\end {array}\]
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$(4) 60^{\circ}$
answered Nov 7, 2013 by pady_1

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