Which of the following sets of concurrent forces may be in equilibrium?

Options

A. `F_1= 3N, F_2= 5N, F_3= 1N`
B. `F_1 = 3N, F_2 = 5N, F_3= 9N`
C. `F_1 = 3N, F_2= 5N, F_3= 6N`
D. `F_1= 3N, F_2= 5N, F_3= 15N`

Answer

3

Explanation

`F_1 - F_2 le |vecF_1 + vec F_2| le F_1 + F_2 `
To produce zero resultant `F_3` must lie between
`F_1 - F_2 le F_3 le F_1 + F_2`