I've finally got the right answer for the first one. Here's my work for anyone having a similar problem:
f=k[(3.85x10^-6)(3.85x10^-6)/(7.8 x10^-2) ]
k[(1.48 x10^-11)/(.006084)]=
21.89
I used coulomb's law which states f=k [(q1)(q2)/(r2)]. k is a constant.
It's the first week of school and my professor has already assigned homework and I don't have my book yet. I am completely lost on two problems:
1)Calculate the magnitude of the force between two 3.85 µC point charges 7.8 cm apart.
Of course the answer is going to be in Newtons due to...