2 small spheres each having a mass of 0.1g are suspended from the same point on silk threads 20cm long. When given equal charges, they repel, resting 24cm apart. Calculate charge of each.
k=8.987x10^9 N*m^2 / c^2
The Attempt at a Solution
I converted grams to kilograms.. 1 x 10^-4 kg
kilograms to newtons/weight..9.8*10^-4N
Here's some work and a diagram. I am 99% sure that the answer is 6.9*10^-8 coulombs. However! I don't understand.. If I used trig to find half of the total force (in the triangle diagram).. why do I use the full distance?
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