# A dipole with an electric moment p is located at a distance r from a long thread charged uniformly with a linear density λ.

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A dipole with an electric moment p is located at a distance r from a long thread charged uniformly with a linear density λ. Find the force F acting on the dipole if the vector p is oriented

(b) along the radius vector r;

(c) at right angles to the thread and the radius vector r.

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does not change as the point of observation is moved along the thread.

+1 vote