Three charges are located along x-axis with first +5c charge at origin, second -1c charge 2m to the right of orgin and the third +2c charge 3m to the right of orgin. a) what is the magnitude and direction of force exerted by the first charge on the second charge?
b) what is the magnitude and direction of force exerted by the third charge on the second charge?
c) what is the net force on the second charge?

Explanation:

a ) Force on the 2 nd  charge by first charge

= k q₁ x q₂ / d²

= 9 x 10⁹ x 5 x 1 / 2² = 11.25 x 10⁹ N  it will be attractive and towards negative  x direction

b ) Similarly, force on 2 nd charge by 3 rd charge

= 9 x 10⁹ x 2 x 1 / 1² = 18 x 10⁹ .

it will act towards + ve x- direction .

c) Net force = 18 x 10⁹ - 11. 25 x 10⁹ = 6.75  x 10⁹ N. It will act towards + ve x-direction.

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it is the second option.