Question

What is the force, in terms of Coulomb's constant, between two electrical charges of `-7 C` and `4 C` that are `3 m` apart?

Answer 1

`2.8xx10^8N`

Explanation:

we know,
`F=1/(4piepsilon_@)(q_1q_2)/d^2`

`=9xx10^9(-7*4)/3^2`

`=cancel(9)xx10^9(-28)/cancel9`

`=-2.8xx10^8N`

the (-) sign indicates attraction.