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Unformatted text preview: x axis. Setting E net = 0 at x = 20 cm (see graph) immediately leads to L = 20 cm. (a) If we differentiate E net with respect to x and set equal to zero (in order to find where it is maximum), we obtain (after some simplification) that location: x = © ¨ § ¹ ¸ · 2 3 3 2 + 1 3 3 4 + 1 3 L = 34 cm. We note that the result for part (a) does not depend on the particular value of ξ . (b) Now we are asked to set ξ = 3 e , where e = 1.60 × 10 − 19 C, and evaluate E net at the value of x (converted to meters) found in part (a). The result is 2.2 × 10 − 8 N/C . 14. For it to be possible for the net field to vanish at some x > 0, the two individual fields...
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This note was uploaded on 09/06/2009 for the course PHYSICS 14358 taught by Professor Bolton during the Spring '09 term at Kansas State University.
 Spring '09
 Bolton
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