P25 065

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65. On the dipole axis θ = 0 or π, so

| cos θ| = 1. Therefore, magnitude of the electric field is

|E(r)| =





∂V

∂r



 =

p

4πε

0





d

dr



1

r

2

 

 =

p

2πε

0

r

3

.


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