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A wire carrying current I is tied betwee...

A wire carrying current I is tied between points P and Q and is in the shape of a circular arch of radius R due to a uniform magnetic field B (perpendicular to the plane of the paper, shown by cross marked) in the vicinity of the wire. If the wire subtends and angle `2 theta_(0)` at the centre of the circle of which it forms an arch) then the tension in the wire is:

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