Two negative charges, Q = -30 \\mu C are placed on the x-axis at x = +0.25 m and

ID: 2120160 • Letter: T

Question

Two negative charges, Q = -30 mu C are placed on the x-axis at x = +0.25 m and x = -0.25 m.

1.How much energy does it take to assemble these two charges?

2.You place an unknown charge on the y-axis at y = 0.5 m and find that the electric potential is 0 V at the origin. What is the unknown charge?

3.If you place a -2 mu C charge at the origin, what is the x-component of the force on it from the other three charges?

4.If you place a -2 mu C charge at the origin, what is the y-component of the force on it from the other three charges?

1.the energy is

U = k x (Q^2/r)

where k = (1/4pi x e_o) = 9 x 10^9 Nm^2/C^2,Q = -30 uC = -30 x 10^-6 C and r = 0.5 m

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