P23_012 - which is clear from the Fgure in the textbook ¯...

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12. By symmetry we see the contributions from the + q charges cancel each other, and we simply use Eq. 23-3 to compute magnitude of the Feld due to the +2 q charge (this Feld points at 45
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Unformatted text preview: , which is clear from the Fgure in the textbook). ¯ ¯ ¯ ~ E net ¯ ¯ ¯ = 1 4 πε 2 q r 2 where r = a/ √ 2. Thus, we obtain ¯ ¯ ¯ ~ E net ¯ ¯ ¯ = q/πε a 2 ....
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