Homework Help: physics Electricity

Posted by frustrated on Thursday, January 24, 2013 at 1:14am.

Two tiny conducting spheres are identical and carry charges of -20.0 μC and +50.0 μC. They are
separated by a distance of 2.50 cm.

(a) What is the magnitude of the force that each sphere experiences, and is the force attractive or repulsive?

(b) The spheres are brought into contact and then separated to a distance of 2.50 cm.
Determine the magnitude of the force that each sphere now experiences, and state whether the force is attractive or repulsive.

physics Electricity - Elena, Thursday, January 24, 2013 at 5:36am
(a) F=k•q₁•q₂/r²=....
k =9•10⁹ N•m²/C²
attraction

(b) the law of conservation of charge:
q(total) = -20+50 = 30 μC
The charge on each sphere is q=15 μC
F =k•q²/r² = …
repulsion

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