80. We interpret the linear charge density, ||/QLλ=, to indicate a positive quantity (so we can relate it to the magnitude of the field). 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)44Errλθθθπε=−−=. Now, the arc length is
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