ch22-p075 - with this line of reasoning, we see that there...

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75. We consider pairs of diametrically opposed charges. The net field due to just the charges in the one o’clock (– q ) and seven o’clock (–7 q ) positions is clearly equivalent to that of a single –6 q charge sitting at the seven o’clock position. Similarly, the net field due to just the charges in the six o’clock (–6 q ) and twelve o’clock (–12 q ) positions is the same as that due to a single –6 q charge sitting at the twelve o’clock position. Continuing
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Unformatted text preview: with this line of reasoning, we see that there are six equal-magnitude electric field vectors pointing at the seven o’clock, eight o’clock … twelve o’clock positions. Thus, the resultant field of all of these points, by symmetry, is directed toward the position midway between seven and twelve o’clock. Therefore, G E resultant points towards the nine-thirty position....
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