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A square wire frame ( initially current is zero) with side a and a straight conductor carrying a constant current I are located in the same plane (figure). The inductance and the resistance of the frame are equal to L and R respectively. The frame was turned through `180^(@)` about the axis OO' separated from the current - carrying conductor by a distance b=2a. The total electric charge having flown through the frame if i=0 at t=0 in the loop is equal to `(mu_(0)aI)/(2piR)lnx`. Find the value of x.

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