Physics WebAssign Ch15 #3

A small sphere of mass m = 7.60 g and charge q1 = 29.9 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.
_____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

[maddcrz]

I don't know who you are, but this saved my life!

[scarlettkeane]

Thank you! This helps a lot. I hate doing the homework without understand where these formulas are coming from. 

[PizzaAesthetics]

i do not understand why the -5.2 turns to positive 5.2

[ZayraThomas]

How did you get 7.60X10^-3? I have no idea where the -3 is coming from.