A small sphere of mass m = 6.80 g and charge q1 = 32.6 nC is attached to the end of a string and hangs vertically as in the figure. A second charge of equal mass and charge q2 = -58.0 nC is located below the first charge a distance d = 2.00 cm below the first charge as in the figure.

(a) Find the tension in the string.

(b) If the string can withstand a maximum tension of 0.180 N, what is the smallest value d can have before the string breaks?


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