Three point charges q1 = 9.3 uC, q2 = - 4.9 uC and q3 are arranged as in the figure. We give h = 4.5 cm and d = 2.9 cm. For what values of q3 is the total potential at the origin equal to (a) 0 V; (b) 290kV? y 92 d h 91 d 93 X >
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