Question

Who knows how to do this?

Answer 1

1) F = 8.789 10² N, 2) F = 1.5 10⁴ N

Step-by-step explanation:

We can solve this exercise using Coulomb's law

F =
`k (q_1q_2)/(r^2)`

Knowing that charges of the same sign repel

let's apply this equation to our case

1) the charges are q = - 0.0025 C and the distance between them r = 8 m

we calculate

F = 9 10⁹ 0.0025 0.0025 /8²

F = 8.789 10² N

as the two charges are of the same sign the force is repulsive

2) q₁ = -0.004C and q₂ = -0.003 C with a distance of r = 3.0 m

we calculate

F = 9 10⁹ 0.004 0.003 / 3²

F = 1.5 10⁴ N