Posted by Jordan on Wednesday, February 11, 2009 at 7:19pm.
Two spherical objects are separated by a distance of 2.41 x 10-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each object experiences an electrostatic force that has a magnitude of 4.18 x 10-21 N. How many electrons did it take to produce the charge on one of the objects?
Can you help at all? Please give me an idea where to start. Thank you.
- physics - linell, Wednesday, February 11, 2009 at 7:23pm
F = Q^2 / (4 pi eps d^2)
then the number electrons is
N = Q /e
where e is the electron's charge (look it up)
- physics - drwls, Wednesday, February 11, 2009 at 7:25pm
The distance between them is
d = 2.41 x 10-3 m
The charge on each sphere is Q
The force of each sphere on the other is
F = k Q^2/d^2 = 4.18 x 10-21 N
Look up the Coulomb's Law constant k and solve that equation for Q.
The number of electrons is
N = Q/e
where e is the electron charge.
- physics - Jordan, Wednesday, February 11, 2009 at 7:53pm
Ok. I did that and I found that Q= 1.64 x 10 ^ -18.
I then divided that by 1.6 x 10 ^ -19.
The answer I got was 10.23.
I am being told that is the wrong answer. Could you please double check that for me?
Answer This Question
More Related Questions
- physics - Two spherical objects are separated by a distance of 1.53 × 10-3 m. ...
- physics - Two spherical objects are separated by a distance of 1.41 × 10^-3 m. ...
- Physics HELP PLEASE - two spherical objects are separated by a distance of 9x10...
- Physics - In a vacuum, two particles have charges of q1 and q2, where q1 = +3.8C...
- physics. Can you check my answer? - Two spherical objects are separated by a ...
- Physics*** - 1) Assume that you have two objects one with a mass of 10 kg and ...
- Physics** - 1) Assume that you have two objects one with a mass of 10 kg and the...
- Physics - In mathematical language, Newton's Law of Gravity expresses the force ...
- physics - A student proposes to measure the gravitational constant G by ...
- science - It is not a homework, it is my question, and I hope it is explained. ...