Question

A small 1.10-gram hollow metal ball is on the end of a plastic rod, while an identical hollow metal ball is suspended from a 12.0-cm string. The ball on the rod is given an electric charge and then touched to the suspended ball, as shown.

     When the ball on the rod is 8.0 horizontal centimeters away from the suspended ball, the string holding the suspended ball makes a 30º angle with the horizontal, as shown.

     Determine the amount of charge on each of the two balls.

Answer 1

Given: m=1.109 = 1.10X10-3 kg Y = 8cm = 0.08 m B = 30° Tusing let amount of charge on each sphere be eq? Tiloso edete for equubnum; T. sino = mg and, T. Coso = Fe mg tamo = mg :: q? mg.y? (1.10X10-3)(9.81)(0.08) k.tano 19x109) (tom (30)) :.q² = 1.329*10-14 c² :9= 1.153 x10-70

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