A charge Q is transferred from an initially uncharged plastic ball to an identical ball 15...

Question

Question

A charge Q is transferred from an initially uncharged plastic ball to an identical ball 15 cm away. The force of attraction i

Answer 1

Answer #1

The distance between two charges or balls r = 15 cm

= 0.15 m

The force of attraction (F) = 20 mN

= 0.020 N

Write the equation for the force of attraction between the balls.

F = k q ² / r ²

Here, Coloumb's constant (k)= 8.99 * 10 ⁹ N.m² / C ²

0.02 = (8.99 * 10 ⁹ ) q ² / (0.15)²

q = 2.23*10^-7 C

Calculate the number of electrons transferred from one ball to the other ball N = q / e

chargfe of electron (e) = 1.6 * 10 ^-19C

N = 2.23*10^-7 / 1.6 * 10^-19

=1.398*10¹² electrons

Answer 2

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