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EimanMahdi · Jun 7, 2011, 01:51 AM

Please I need you all help to answer this problem and thanks
1-Two table tennis balls hang with their centers 0.1m apart. The charge on ball A is 6x10-9C, and the charge on Ball B is 􏰃15x10-9 C. What is the force of attraction between the balls?

2- In an experiment using Coulomb's apparatus, a sphere with a charge of
3.6x10-8 C is 0.14m from a second sphere of unknown charge. The force
between the spheres is 2.7x10-2N. What is the charge of the second sphere?

3-At what distance would the repulsive force between two electrons have a
magnitude of 2.0 N? Qe=-1.6x10-11 C, k=9x109N.m2/C2.

4-Two identical small spheres are charged, touched together then separated.
Their centers are 12cm apart. They repel one another with a force of
3.0x10-5N. How much charge does each sphere has?

ebaines · Jun 7, 2011, 05:52 AM

We're not going to do your homework for you, but here's a hint - for each of these problems you apply Coulomb's Law:

$<br /> F = k_e \frac {q_1 q_2} {r^2}<br />$

For number for the only "trick" is to realize that since the two spheres were touched their charge is the same.

Post back with the answers you get and we'll check them for you.