First slide
Electrostatic potential
Question

Uniform electric field exists in a region and is given by E=E0i^+E0j^. There are four points A(-a, 0), B(0 , -a), C(a, 0), and D(0, a) in the xy plane. Which of the following is the correct relation for the electric potential? 

Moderate
Solution

Since potential decreases along electric field as E=dV/dx, VA>VC and VB>VD. Also due to symmetry

VA=VB, VC=VD

VA=VB>VC=VD

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