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21) A charged polyester ball is placed over a charged PVC pipe. The ball, which
has a mass of 1.2 grams, rests 42 cm above the pipe. If the ball and pipe have
the same negative charge, what is the charge on the ball?

21 A charged polyester ball is placed over a charged PVC pipe The ball which has a mass of 12 grams rests 42 cm above the pipe If the ball and pipe have the sam class=

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onyebuchinnaji

The negative charge on the polyester ball is -1.53 x 10⁻⁶ C.

The given parameters;

  • mass of the ball, m = 1.2 g
  • distance between the ball and the pipe = 42 cm = 0.42 m

The gravitational force on the ball is calculated as follows;

F = mg

F = 0.012 x 9.8

F = 0.12 N

The electrostatic force on the ball is calculated as follows;

[tex]F= \frac{kq^2}{r^2} \\\\q^2 = \frac{Fr^2}{k} \\\\q = \sqrt{\frac{0.12 \times (0.42)^2}{9\times 10^9}} \\\\q =+/ -\ \ 1.53 \times 10^{-6} \ C\\\\q =-\ \ 1.53 \times 10^{-6} \ C[/tex]

Thus, the negative charge on the polyester ball is -1.53 x 10⁻⁶ C.

Learn more here:https://brainly.com/question/18108470

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