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Physics, 23.03.2021 03:00 alott1121

gives the magnitude B of the magnetic field set up by a current in an infinitely long straight wire, at a point P at perpendicular distance R from the wire. Suppose that point P is actually at perpendicular distance R from the midpoint of a wire with a finite length L. Using the equation to calculate B then results in a certain percentage error. What value must the ratio L/R exceed if the percentage error is to be less than 1.34%

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