A point charge Q1 is distance r from the center of a dipole consisting of charges +/- q2 separated by distance s. The charge is located in the plane that bisects the dipole. At this instant, assuming r>> s,
Part A: what is the magnitude of the force on the dipole?
Part B: what is the magnitude of the torque on the dipole?
In the space provided, enter the factor that multiplies (1/ε0) in your answer. Express this factor in terms of q2, Q1, s, π, and r.
The Attempt at a Solution
Substituting equation 1and 2 into equation 3
F = qE
τ = pEsinϑ
I got a feeling I'm missing an important step involving Q1 in both parts.
Help's much appreciated =)