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Questions  

A point dipole  p=p0x 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 indignity)

a
|p→|4πε0d2,−p→4πε0d3
b
|p→|4πε0d2,p→4πε0d3
c
0,P⇀4πε0d3
d
0,0

detailed solution

Correct option is C

On equatorial line, V=kPcosθr2=0∵θ=90   E=P4πε0d3

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