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Question

A,B,C,D,P and Q are points in 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:

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A
10Vm1 along PQ
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B
152Vm1 along PA
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C
5Vm1 along PC
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D
5Vm1along PA
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Solution

The correct option is C 152Vm1 along PA
Electric field E=dVdxdVdy=ΔVΔxΔVΔy
Ex=VDVAxDxA=520.2=15 V/m
Ey=VBVAyByA=520.2=15 V/m
Ex and Ey are same in magnitude and perpendicular to each other so resultant will be at angle of π/4 or along with PA
Enet=E2x+E2y=152 Vm1

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