Please Help w/Physics :-/

Two charged particles, q1 = −2.50×10−3 C and q2 = +3.850e-3 C, are separated by a distance of 5.00 cm. (a) What is the electric potential energy of this configuration? (b) What is the electric potential at a point midway between the particles?


Thank You!

(a).

dW = F dr

dW = kQq/r² dr

. . . . r
W = ∫ kQq/r² dr
. . . ∞

W = -kQq/r

W = -(9 * 10^9)(-2.50 * 10^-3)(3.85 * 10^-3)/0.05

W = 1.7325 * 10^6 Joule




(b).

V = V1 + V2

V = kQ/r + kq/r

V = k(Q + q)/r

V = (9 * 10^9)(-2.50 * 10^-3 + 3.85 * 10^-3)/(½ * 0.05)

V = 486000000 volt