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Figure (a) shows two wires, each carryi...

Figure (a) shows two wires, each carrying a current. Wire 1 consists of a circular are of radius R and two radial lengthsit carries current `i_(t)=20A` in the direction indicated. Wire 2 is long and straigth it carries a current `i_(2)` that can be varried and it is at distance `R//2` from the centre of the are. The net magnetic field `vec(B)` due to the current is measured at the center of curvature of the are Figure (b) is a plot of the component of `vec(B)` in the direction prependicular to the figure as a function of current `i_(2)` What is the angle subtended by the arc ?

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