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A perfect (or pure) dipole is the contrary to a 'physical' dipole. The Physical (electric) dipole consists of two equal and oppsite charges (+/-)q, separated by a finite, and well defined distance, d.
The perfect dipole is a model (or an approximation) for the physical dipole, where we say that d is ~equal to zero. This is legit when we observe the dipole (measure the electric field, E, or the potential, V) at distances, r, far greater than d, and simplifies our equations for E(r,t) and V(r,t).
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoif charge q gets larger,and the distance 2a gets smaller and smaller,keeping the product |p|=q(2a)= constant, we get d an ideal dipole
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