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Correct option is A)

Thus, $E_{x}=Ecosθ$ , $E_{y}=Esinθ$ and $E_{z}=0$

Since $E=−dr∇V $

So, $dV_{x}=−E_{x}dx$, $dV_{y}=−E_{y}dy$ and $dV_{z}=−E_{z}dz$

Now ingratiating, $V_{x}=−∫_{d}Ecosθdx=−Ecosθ(0−d)=Edcosθ$

$V_{y}=−∫_{d}Esinθdy=−Esinθ(0−d)=Edsinθ$

and $V_{z}=0$

Thus, potential between O and A is $V=V_{x}+V_{y}+V_{z}=Edcosθ+Edsinθ$

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