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A loop of diameter d is placed at a distance 9d from a long straight wire. A current of 20 A flows both in the wire and
in the loop, as shown in the figure. The loop feels a torque of 5.0 x 10¬º Nm.
9d
Wire
(a) Is the torque felt by the loop clockwise or counterclockwise? Explain.
(b) Find the diameter d of the loop.

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