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Unformatted text preview: xaxis where the total EFeld vanishes. [Examine points between the charges and points to the left of the negative charge.] a. ±or x > the Felds of the two charges are in opposite directions. Since the larger one is farther away, there is some point for which the two magnitudes are equal, making the Felds cancel. b. We have, setting the two Feld magnitudes equal: 4 ( x + d ) 2 = 1 x 2 , or 2 x = x + d . This gives x = d . c. ±or points between the charges, the two Felds are in the same direction and cannot cancel. ±or points where x < − d the larger charge is closer than the smaller charge, so the magnitudes cannot be equal. x − 4 q q d Physics 54 Summer 2011 2...
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 Summer '09
 Thomas
 Physics, Charge, Electric charge, certain closed surface

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