Question

Determine potential of a dipole at axial position​

Answer 1

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I have answered correctly

Answer 2

the electric potential is 4πε01((r2−4a2)2P) 

Explanation:

Let P be an axial point at distance r from the center of the dipole. Electric potential at point P is given as

V=V1+V2

V1and V2are the potentials at point P due to charges +q and –q respectively

  V=4πε01(r−2aq+(r+2a−q))

 V=4πε01((r2−4a2)4a)

 V=4πε01((r2−4a2)2P)

Hence, the electric potential is 4πε01((r2−4a2)2P)