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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 

(a) along the thread; 

(b) along the radius vector r; 

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

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(a)  along the thread.

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

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