P23_020 - 20. From symmetry, we see that the net field at...

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Unformatted text preview: 20. From symmetry, we see that the net field at P is twice the field caused by the upper semicircular charge +q = λ · πR (and that it points downward). Adapting the steps leading to Eq. 23-21, we find Enet = 2 −ˆ j λ sin θ 4πε0 R 90◦ −90◦ =− q ˆ. j ε0 π 2 R 2 ...
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