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**1. . An electric dipole located at the origin in free space has a moment p = 3ax −2ay +az nC·m. Find V at r = 2.5, θ =30◦, φ =40◦.**

I find it difficult to solve when its in spherical co-ordinates.

**2.Relevent Eq**

V =P.(

**r-r'**)/( 4∏ε|r−r'|

^{2})(|r-r'|)

I am confused how to find a unit vector on spherical co-ordinate. ie |r-r'|

This que is from william Hayt and page no 100.