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December 23, 2014

Homework Help: physics

Posted by Beth on Sunday, September 16, 2007 at 12:08am.

A test charge (q=-5uC) lies between two positive charges: 3cm from a 2uC positive charge, and 2 cm from a 3uC positive charge. Find the force and direction (in newtons) on the test charge.

I know I have to use Coulomb's law:
so:

F = KQ/r^2 = 8.99e9*2e-6/.03^2
F = 8.99e9*3e-6/.02^2

But then I'm not sure how I use these to find the force on the test charge, and whether it it towards the 2uC or 3uC charge.

Any help is greatly appreciated!

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