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(10 points) Three point charges are positioned in the x-y plane as follows: 5 nC at y=5 cm,-10 nC at y=-5cm, and 15 nC at x=-5 cm. Find the x.y coordinates of a 20 nC fourth charge that will produce a zero electric field at the origin. 4.
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05) -54000コ ksi 51oo 2 o k23 5i1 000 dl nud o hald at

dy is -ve because we need zero electric field at origin

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