1) Two 21.0 x 10-9 C point charges are located on the x axis. One is at x = 0.30

Question

1) Two 21.0 x 10-9 C point charges are located on the x axis. One is at x = 0.30 m, and the other at x = - 0.30 m.

a) A third identical charge is placed on the y axis at y = 0.30 m. Find the magnitude of the force acting on this third charge? Answer in Newtons.

b) Now the third identical charge is placed on the y axis at y = 2 x 0.30 m. Find the magnitude of the force acting on this third charge? Answer in Newtons.

2)

Four charges are placed at the corners of a square. The side of the square is a = 0.30 m.

a) If the charge are identical and positive q = 21.0 x 10-9 C what would be the magnitude of the force acting on each of the charges? Answer in Newtons.

b) We change the charges by q1 = 21.0 x 10-9 C, q2 = 11.0 x 10-9 C, q3 = -12.0 x 10-9 C, q4 = -31.0 x 10-9 C. What would be the magnitude of the force acting on charge q3? Answer in Newtons.

c) We place the same charges at the corners of a rectangle of sides a and b (instead of a square). If b=2a/3 what would be the magnitude of the force acting on charge q3? Answer in units of Newtons.

Explanation / Answer

V=kq/r (or at least this is the equation I have been attempting to use to solve this)
k= 9 x 10^9 Nm^2/C^2
q= 4 x 10^-6 C
r= 3.0 m

3. The attempt at a solution

[(9x10^9)(4x10^-6)]/.3=1.2X10^5

Since all charges are the same I take that answer multiply by four to get the sum, which gives me 4.8x10^5 V.

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