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A point dipole x ˆ p p 0 − = G is kept at the origin. The potential and electric field due to this dipole on the y-axis at a distance d are, respectively: (Take V= 0 at infinity)

1. 3 0 2 0 d 4 p , d 4 p ∈ π − ∈ π G G
2. 3 0 d 4 p , 0 ∈ π − G
3. 3 0 2 0 d 4 p , d 4 p ∈ π ∈ π G G
4. 3 0 d 4 p , 0 ∈ π − G

Correct answer: 3 0 d 4 p , 0 ∈ π − G

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