A small sphere of mass m = 6.40 g and charge q1 = 30.3 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.

Question

(a) Find the tension in the string.
N

(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?
cm

Answer 1

Which string? Assuming the string holding between the masses.

Tension= mg-kq1q2/.02^2