\( A, B, C, D, P \) and \( Q \) are points in a uniform electric field. The potentials at these ...

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\( A, B, C, D, P \) and \( Q \) are points in a uniform electric field. The potentials at these points are \( V(A)=2 \) volt. \( V(P)=V(B)=V(D)=5 \) volt. \( V(C)=8 \) volt. The electric field at \( P \) is
(a) \( 10 \mathrm{Vm}^{-1} \) along \( P Q \)
(b) \( 15 \sqrt{2} \mathrm{Vm}^{-1} \) along \( P A \)
(c) \( 5 \mathrm{Vm}^{-1} \) along \( P C \)
(d) \( 5 \mathrm{Vm}^{-1} \) along \( P A \)
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