Homework Help: physics

Posted by Claire on Sunday, July 20, 2008 at 10:35pm.

Two charges separated by one meter exert 1 Newton forces on each other. If the magnitude of each charge is doubled, the force on each charge is ______ Newtons.

Thanks!

physics - GK, Sunday, July 20, 2008 at 11:18pm
Coulomb's Law is:
F = kQ1*Q2 / d^2
k is a constant

Let's represent each charge as "q"
then the intial force F1 is:
F1 = k*q*q / 1^2 = kq^2

doubling the charge, the new force, F2, is:
F2 = k(2q)(2q) / 1^2 = 4kq^2

F2 is how many times bigger than F1?
physics - Claire, Sunday, July 20, 2008 at 11:24pm
4 times bigger - so I think the answer would be 4 Newtons.
physics - Anonymous, Thursday, March 19, 2009 at 8:28pm
4 newtons

Answer this Question

Related Questions

Physics Problems - Can you please help me with the following problem? Two ...
physics - Two charges seperated by 1 meter exert a 1 N force on eachother. If ...
Physics Questions - Can you please help me with some and check my answers? ...
Physics 2 - A pair of charges exert attractive forces of magnitude 2.4*10^-2 N ...
Physics - Three Point charges have equal magnitudes, two being positive and one ...
Physics - Three Point charges have equal magnitudes, two being positive and one ...
Physics - Two point charges attract each other with an electric force of ...
Physics - Two positive charges with the same magnitude are one meter apart. ...
Physics Need Help PLEASE - Two point charges are separated by 8 cm. The ...
physics - Two point charges totaling 9.00 µC exert a repulsive force of 0....

For Further Reading

First Name:
School Subject:
Answer: