Answer:
2.92 x 10¹² electrons
Explanation:
given,
distance between two plastic ball, r = 17 cm
r = 0.17 m
Force of attraction = F = 68 mN
F = 0.068 N
number of electron transferred from one ball to another.
using Coulomb Force equation
q² = 2.1835 x 10⁻¹³
q = 4.67 x 10⁻⁷ C
now, number of electron
e is the charge of electron which is equal to 1.6 x 10⁻¹⁹ C
N = 2.92 x 10¹² electrons
electrons were transferred from one ball to the other is 2.92 x 10¹²