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Unformatted text preview: 10. The individual magnitudes ¯ ¯ ¯ ~ E 1 ¯ ¯ ¯ and ¯ ¯ ¯ ~ E 2 ¯ ¯ ¯ are figured from Eq. 233, where the absolute value signs for q 2 are unnecessary since this charge is positive. Whether we add the magnitudes or subtract them depends on if ~ E 1 is in the same, or opposite, direction as ~ E 2 . At points left of q 1 (on the − x axis) the fields point in opposite directions, but there is no possibility of cancellation (zero net field) since ¯ ¯ ¯ ~ E 1 ¯ ¯ ¯ is everywhere bigger than ¯ ¯ ¯ ~ E 2 ¯ ¯ ¯ in this region. In the region between the charges (0 < x < d ) both fields point leftward and there is no possibility of cancellation. At points to the right of q 2 (where x > d ), ~ E 1 points leftward and ~ E 2 points rightward so the net field in this range is ~ E net = ¯ ¯ ¯ ~ E 2 ¯ ¯ ¯ − ¯ ¯ ¯ ~ E 1 ¯ ¯ ¯ in the ˆ i direction . Although  q 1  > q 2 there is the possibility of ~ E net = 0 since these points are closer to q 2 than to q 1 ....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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