problem21_42

University Physics with Modern Physics with Mastering Physics (11th Edition)

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21.42: The point where the two fields cancel each other will have to be closer to the negative charge, because it is smaller. Also, it cant’t be between the two, since the two fields would then act in the same direction. We could use Coulomb’s law to calculate the actual values, but a simpler way is to note that the 8.00 nC charge is twice as large as the
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Unformatted text preview: 4.00 nC Charge. The zero point will therefore have to be a factor of 2 farther from the 8.00 nC charge for the two fields to have equal magnitude. Calling x the distance from the 4.00 nC charge: m 90 . 2 2 20 . 1 = = + x x x...
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