Two identical insulating balls are suspended by a seperate0.25m threads that are

Question

Two identical insulating balls are suspended by a seperate0.25m threads that are attached to a common point on a ceiling.Each ball has a mass of 8.0 x 10E-4 Kg. At first the balls areuncharged and hang straight down. They are given identical positivecharges and as a result spread apart with an angle of 36 degreesbetween the threads. Determine a) the charge on each ball and b)the tension in the threads. please help.... Two identical insulating balls are suspended by a seperate0.25m threads that are attached to a common point on a ceiling.Each ball has a mass of 8.0 x 10E-4 Kg. At first the balls areuncharged and hang straight down. They are given identical positivecharges and as a result spread apart with an angle of 36 degreesbetween the threads. Determine a) the charge on each ball and b)the tension in the threads. please help....

Explanation / Answer

From force diagram we get: Fg * tan(18o) =Felectrostatic repulsion = .00255
r = 2 *.25 * sin(18o) = .105
Felectrostatic repulsion =Q1Q2/(4o*r2)-> Q1 =Q2 ->
a) Q = sqrt(Fe * 4o *r2) = 9.98 *10-8 C
b) T = sqrt(Fg2 +Fe2) = 8.25*10-3 N

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