Physics WebAssign Ch15 #4

A small sphere of charge q1 = 0.808 µC hangs from the end of a spring as in figure (a). When another small sphere of charge q2 = −0.612 µC is held beneath the first sphere as in figure (b), the spring stretches by
d = 3.78 cm from its original length and reaches a new equilibrium position with a separation between the charges of r = 5.15 cm. What is the force constant of the spring?
_____N/m

[ulises]

why don't you include the force of the weight (mg)? Fs-mg-Fe=0?

[lifeofbeverlyok]

you are sooo awesome! thanks so much for this! ahhhh. this stuff is so confusing but you helped so much. thank you.