A point charge q 1 = -3.1 ?C is located at the origin of a co-ordinate system. A

Question

A point charge q1 = -3.1 ?C is located at the origin of a co-ordinate system. Another point charge q2 = 7.5 ?C is located along the x-axis at a distance x2 = 6.9 cm from q1.

1)What is F12,x, the value of the x-component of the force that q1 exerts on q2? -43.95N

2) Charge q2 is now displaced a distance y2 = 2 cm in the positive y-direction. What is the new value for the x-component of the force that q1 exerts on q2? -39.1N

A third point charge q3 is now positioned halfway between q1 and q2. The net force on q2 now has a magnitude of F2,net = 13.515 N and points away from q1 and q3. What is the value (sign and magnitude) of the charge q3? ?C

I need the ansowe of #3 please

Explanation / Answer

since both the charges are on x axis

so there will be only x component of a force

and its magnitude F=kq1q2/x22

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