ch21-p017

# ch21-p017 - 17. (a) The distance between q1 and q2 is r12 =...

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17. (a) The distance between q 1 and q 2 is () ( ) 22 2 2 12 2 1 2 1 0.020 m 0.035 m 0.015 m 0.005 m 0.056 m. rx xy y =− + = + = The magnitude of the force exerted by q 1 on q 2 is ( ) ( ) 92 2 6 6 12 21 12 8.99 10 N m C 3.0 10 C 4.0 10 C || 35 N. (0.056 m) qq Fk r −− ×⋅ × × == = (b) The vector G F 21 is directed towards q 1 and makes an angle θ with the + x axis, where 11 21 1.5 cm 0.5 cm tan tan 10.3 10 . 2.0 cm 3.5 cm yy xx ⎛⎞ = ° ° ⎜⎟ ⎝⎠ (c) Let the third charge be located at ( x 3 , y 3 ), a distance r from q 2 . We note that q 1 , q 2 and q 3 must be collinear; otherwise, an equilibrium position for any one of them would be impossible to find. Furthermore, we cannot place q 3 on the same side of q 2 where we also find q 1 , since in that region both forces (exerted on q 2 by q 3 and q 1 ) would be in the same
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## This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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