ch22-p080 - 80. We interpret the linear charge density, =|...

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80. We interpret the linear charge density, | |/ QL λ = , 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 [] arc 00 2s i n (/ 2 ) sin( / 2) sin( / 2) 44 E rr λθ θθ πε =− = . Now, the arc length is
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