ch21-p018 - 18. (a) For the net force to be in the +x...

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18. (a) For the net force to be in the + x direction, the y components of the individual forces must cancel. The angle of the force exerted by the q 1 = 40 µ C charge on 3 20 qC = is 45°, and the angle of force exerted on q 3 by Q is at – θ where 1 2.0 cm tan 33.7 . 3.0 cm ⎛⎞ = ⎜⎟ ⎝⎠ Therefore, cancellation of y components requires () ( ) 13 3 22 || sin 45 sin 0.02 2 m (0.030 m) (0.020 m) qq Q q kk °= + from which we obtain | Q | = 83 C. Charge Q is “pulling” on
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