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Let four point charges be located at the vertices of a rectangle as shown in the figure. We give Q = 4 nC, Q1 =

Let four point charges be located at the vertices of a rectangle as shown in the figure. We give Q = 4 nC, Q1 = -4Q, Q2 = -4Q, Q3 = 5Q and Q4 = 2Q, as well as dA = 5cm and dB = 3 cm. What is the resultant electric force, from the other three charges, exerted on (a) the charge Q2 and (b) the charge Q1?

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