Posted by **Will** on Tuesday, September 18, 2007 at 9:24pm.

two spherical objects are separated by a distance of 9x10^-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 4.55 x 10^-21 N. How many electrons did it take to produce the charge on one of the objects?

the answer is 40 electrons but i have no idea how to do it

- Physics HELP PLEASE -
**bobpursley**, Tuesday, September 18, 2007 at 9:47pm
From the force, and coulomb's force equation, solve for q^2 then q.

divide q by e, the charge on one electron to get the number of electrons.

## Answer This Question

## 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 - Two spherical objects are separated by a distance of 2.41 x 10-3 m. ...
- Physics - Two spherical objects are separated by a distance of 2.97 × 10-3 m. ...
- 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 - There is an electric field at a certain point P, where initially there...
- Physics - In mathematical language, Newton's Law of Gravity expresses the force ...

More Related Questions