This time I set F=3.3x10^-21 and divided this by the right side of the equation which I calculated out to be (9x10^9)(1.6x10^-19)(1.6x10^-19)/(.2x.2) which gave me a value of 578,125 electrons. Do I need to divide this value by 2 to get the number of electrons that need to be present on each...
Homework Statement: Two small spheres spaced 20.0 cm apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 3.33×10^−21N?
Homework Equations: Charge of an electron e=-1.6X10^-19 C
F=kq/(r^2)
For this I set...