Two balloons having the same charge of 1.2 × 10-6 coulombs each are kept 5.0 × 10-1 meters apart. What is the magnitude of the repulsive force between them? (k = 9.0 × 109 newton·meter2/coulombs2)
1.2 × 10-2 newtons
3.2 × 10-3 newtons
6.5 × 10-3 newtons
3.0 × 10-4 newtons
5.2 × 10-2 newtons

Question

Two balloons having the same charge of 1.2 × 10-6 coulombs each are kept 5.0 × 10-1 meters apart. What is the magnitude of the repulsive force between them? (k = 9.0 × 109 newton·meter2/coulombs2)
1.2 × 10-2 newtons
3.2 × 10-3 newtons
6.5 × 10-3 newtons
3.0 × 10-4 newtons
5.2 × 10-2 newtons

aaronq · Answer

$\sf \huge  F=k\dfrac{q_1*q_2}{r^2}$

anonymous · Answer

I dont know how to plug in everything @aaronq

aaronq · Answer

q is the charge, r is the radius, k is the constant

$\sf F= (9.0 *10^9~Nm^2/C^2 )\dfrac{(1.2*10^{-6}C)*(1.2*10^{-6}C)}{(5.0 *10^{-1}m)^2}$

anonymous · Answer

Thank you! This really helps my mind gets jumbled with these type of questions

aaronq · Answer

no problem! they can be a bit daunting at first but you'll get the hang of it. Post physics q's in the correct section next time though :P

anonymous · Answer

This is my first time using this so Im still figuring stuff out but I will and thank you again

aaronq · Answer

okay cool. if you want to see an introductory guide or something go to the Openstudy feedback section and post "how do i use this site" or something. People are always there to help out with that. 

good luck with your studies!