# Homework Help: Coulomb's law questions

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?

What if q1 was tripped and the distance doubled?

Thanks

2. Mar 11, 2004

### Loren Booda

F=kq1q2/r2 in general.

Substitute

n1q1 for q1

or

n2q2 for q2

or

(nrr)2 for r2

where n1, n2 and nr are the fractional modifications you seek to introduce.

So, what happens to a given F when nr=1/3; i. e., the interaction distance is reduced by a factor of three?

3. Mar 12, 2004

### UrbanXrisis

Could you tell me if I am doing this right?

What will happen the to force if:

one of the charge was doubled.
I think that the force would double

What if q1 and q2 were cut in half?
I think that the force would be reduced by 1/4

the distance is tripled?
I think that the force would be reduced by 1/9

the distance is cut in half?
I think that the force would increase four times

What if q1 was tripped and the distance doubled?
I think that the force would be mult. by 3/4?

Thanks

4. Mar 12, 2004

### jamesrc

Yep. Looks like you've mastered these type of questions.