1) Find the electric potential V at the center of the electric dipole in the fig

Question

1) Find the electric potential V at the center of the electric dipole in the figure below. Express your answer in terms of Q and L. (Use any variable or symbol stated above along with the following as necessary: k.)

2) Two particles with Q1 = 42

Find the electric potential V at the center of the electric dipole in the figure below. Express your answer in terms of Q and L. (Use any variable or symbol stated above along with the following as necessary: k.) Two particles with Q1 = 42 muC and Q2 = 81 muC are initially separated by a distance of 2.3 m and then brought closer together so that the final separation is 1.3 m. What is the change in the electric potential energy?

Explanation / Answer

1) V+ = (kQ/L)

V- = -(kQ/L)

V = V+ + V- = 0

2)
U1 = k*Q1*Q2/r1 = (9*10^9*42*10^-6*81*10^-6)/(2.3) = 13.312 J

U2 = k*Q1*Q2/r2 = (9*10^9*42*10^-6*81*10^-6)/(1.3) = 23.552 J

dU = U2-U1 = 10.24 J

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