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Relation Between Electric Field & Potential Physics Class 12 Chapter 2

#5. Relation Between Electric Field & Potential 

Consider two closely spaced equipotential surfaces A and B with potential values V and V + δ V, where δ V is the change in V in the direction of the electric field E. Let P be a point on the surface B. δ l is the perpendicular distance of the surface A from P. Imagine that a small unit positive charge dq is moved along this perpendicular from the surface B to surface A against the electric field. The work done in this process is
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