Question

Two foam peanuts become equally charged as they fall out of a cardboard box. Each foam peanut carries a charge of 8 x 10^-4 C. If the peanuts are 0.05 m apart, what is the electric force between them? Assume that k = 9 x 10^9 Nm^2/C^2. Use Coulomb’s law equation: F = kq1q2/r^2.

A. 115,200 N
B. 2,304,000 N
C. 0.000000434 N
D. 0.0000086 N

Answer 1

Answer labeled B : 2,304,000 N

Step-by-step explanation:

Recall the formula for the electric force:

`F_e=9\,\,10^9\, \, (q_1*q_2)/(d^2) \\F_e=9\,\,10^9\, \, (8\,10^(-4)*8\,10^(-4))/(0.05^2) \\F_e=2,304,000\,\,N`

which agrees with answer B provided.