Question: (a) Write an expression for the electric field at a point (0, y) on the dipole axis for y > d/2. What is the direction

(a) Write an expression for the electric field at a point (0, y) on the dipole axis for y > d/2. What is the direction of the field?

(b) Show that when y ≫ d, E ≈ 2kqd/y3. 

(c) The field is inversely proportional to the distance cubed. Does this conflict with Coulomb’s law? Explain.

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