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- PHY102 Physics II © Dr.Cem Özdoğan
- 24-8 Potential due to an Electric Dipole
- At P, the positive point charge (at distance r(+)) sets up potential V(+) and the negative point charge (at distance r(-)) sets up potential V(-). Then the net potential at P is:
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- Point P is a distance r from the midpoint O of a dipole. The line OP makes an angle θ with the dipole axis.
- If P is far from the dipole, the lines of lengths r(+) and r(-) are approximately parallel to the line of length r, and the dashed black line is approximately perpendicular to the line of length r(-).
- Naturally occurring dipoles are quite small; so we are usually interested only in points that are relatively far from the dipole, such that d<<r, where d is the distance between the charges. If p = qd,