63. First, we need a formula for the field due to the arc. We use the notation λfor the charge density, λ= Q/L. Sample Problem 22-3 illustrates the simplest approach to circular arc field problems. Following the steps leading to Eq. 22-21, we see that the general result (for arcs that subtend angle θ) is arc002sin(/2)sin( / 2) sin(/ 2)44Errλλθθθπε=−−=. Now, the arc length is L = rθwith θ is expressed in radians. Thus, using Rinstead of
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