# Homework Help: Coulomb's law

1. Mar 11, 2004

### UrbanXrisis

questions relate to coulomb's law.

What will happen the to force if:

one of the charge was doubled. (ex.q1 was doubled)
I think that the force would double as well right?

What if q1 and q2 were cut in half?

the distance is tripled?

the distance is cut in half? How do I figure this out?

What if q1 was tripped and the distance doubled?

Thanks

2. Mar 11, 2004

### Loren Booda

3. Mar 11, 2004

### Philcorp

TO do this you need to look at the form of coulombs law. It is given by:
$F_c=\frac{1}{4\pi\epsilon_0}\frac{q_1q_2}{r^2}$
where r is the separation distance btw the paticles and q1 and q2 are the charges of the particles in question. By looking aT what should happen to F when you say double q1 you should be able to figure it all out

4. Mar 12, 2004

### UrbanXrisis

If a question asked to find how many excess electrons are on a particle charged -4.0E-17C, what should I do? I know that the charge of a electron is -1.602E-19C but how do I know how many excess electrons there are?

5. Mar 12, 2004

### gnome

If a question asked you how many tomatoes were in a sack containing 1 kg of tomatoes if each tomato is 200 g, how would you solve that?