Two small identical metal spheres, A and B, on insulated stands, are each given a charge of +2.4 10-6 coulomb. The distance between the spheres is 7 10-1 meter. Calculate the magnitude of the electrostatic force that the charge on sphere A exerts on the charge on sphere B.
That is really the same question with different numbers
k Q1 Q2 / d^2
k = 9*10^9
Q1 = Q2 = 2*10^-6 Coulomb
d = 0.2 meter
F = 9*10^9 * 4*10^-12 / 0.04
= 900 *10^-3 = 0.900 N
You are welcome.
What is the final answer?
You do it, I check :)
So did I.
forgot to square distance
0.07405 N / 7*10^-1 = 0.1057 = 1.05*10^-1 N
still do not agree.
Whew :)
k = 9*10^9 approx as I remember
F = k Q1 Q2 / d^2
= 9*10^9 * 2.4*10^-6 * 2.4*10^-6 / 7*10^-1
= [9 * 2.4^2 / 7 ] * 10 ^-2