Homework Help: physics

Posted by ashley on Wednesday, September 2, 2009 at 9:42pm.

Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 3.30 10-6 kg. The gravitational force that each sphere exerts on the other is balanced by the electric force.
(a) What algebraic signs can the charges have?

1the same algebraic sign, both positive or both negative
opposite algebraic sign, one positive and one negative
the same algebraic sign, both negative
the same algebraic sign, both positive

(b) Determine the charge magnitude.

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