P23_056

# P23_056 - q 2(where x> d ~ E 1 points leFtward and ~ E 2...

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56. Let q 1 = 4 Q< 0and q 2 =+ 2 Q> 0 (where we make the assumption that Q> 0). Also, let d =2 . 00 m, the distance that separates the charges. The individual magnitudes ¯ ¯ ¯ ~ E 1 ¯ ¯ ¯ and ¯ ¯ ¯ ~ E 2 ¯ ¯ ¯ are fgured From Eq. 23-3, 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 .A tp o i n t s l e F to F q 1 (on the x axis) the felds point in opposite directions, but there is no possibility oF cancellation (zero net feld) since ¯ ¯ ¯ ~ E 1 ¯ ¯ ¯ is everywhere bigger than ¯ ¯
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Unformatted text preview: q 2 (where x > d ), ~ E 1 points leFtward and ~ E 2 points rightward so the net feld 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 . Thus, we look For the zero net feld point in the x > d region: ¯ ¯ ¯ ~ E 1 ¯ ¯ ¯ = ¯ ¯ ¯ ~ E 2 ¯ ¯ ¯ 1 4 πε | q 1 | x 2 = 1 4 πε q 2 ( x − d ) 2 which leads to x − d x = r q 2 | q 1 | = r 1 2 . ThereFore, x = d √ 2 √ 2 − 1 = 6 . 8 m specifes the position where ~ E net = 0 ....
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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.

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