P22_010 - 10. There is no equilibrium position for q3...

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10. There is no equilibrium position for q 3 between the two Fxed charges, because it is being pulled by one and pushed by the other (since q 1 and q 2 have di±erent signs); in this region this means the two force arrows on q 3 are in the same direction and cannot cancel. It should also be clear that o±-axis (with the axis deFned as that which passes through the two Fxed charges) there are no equilibrium positions. On the semi-inFnite region of the axis which is nearest q 2 and furthest from q 1 an equilibrium position for q 3 cannot be found because | q 1 | < | q 2 | and the magnitude of force exerted by q 2 is everywhere (in that region) stronger than that exerted by q 1 on q 3 . Thus, we must look in the semi-inFnite region of the
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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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