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A square frame carrying a current I = 0...

A square frame carrying a current `I = 0.9 A` is located in the same plane as a long straght wire carrying a current, `I_(0) = 5.0 A`. The frame side has a length `a = 8.0 cm`. The axis of the frame passing thorugh the midpoints of opposite sides is parallel to the wire and is separated from it by the distance which is `eta = 1.5` times greater than the side of the frame. FInd:
(a) Ampere force acting on the frame,
(b) the mechnical work to be performed in order to turn the frame throguh `180^(@)` about its axis, with the currents maintained constant.

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