Which of the following statement is correct in the given figure Infinitely long wire kept perpendicular to the paper carrying current inwards . The sides BC and AD of the loop are radial .Plane of the loop is in the plane of page .

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Which of the following statement is correct in the given figure Infinitely long wire kept perpendicular to the paper carrying current inwards . The sides BC and AD of the loop are radial .Plane of the loop is in the plane of page .

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Net force on the loop is zero

Net torque on the loop is zero

Loop will rotate anti clockwise about axis OO’ when seen from O

Loop will rotate anticlock wise about OO’ when seen from O

answer is A, C.

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Detailed Solution

$\vec{F} = i (\vec{l} \times \vec{B})$ net force on the loop is zero. $τ = \vec{M} \times \vec{B}$ in fig from B to C and AD the magnetic field is variable. On AB and CD force is zero. The forces on BC and AD forms
a couple.