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Relation between Gravitational Potential and Field #8211; If gravitational field intensity is E, then for a small displacement dr, the change in gravitational potential is given by dV = V (r<sub>2</sub>) #8211; V (r<sub>1</sub>) = #8211; ∫r<sub>2</sub> r<sub>1</sub> E.dr where, r<sub>1</sub>and r<sub>2</sub> are two position vectors. Hence, electric field (E) can be given by E = E<sub>x</sub>i E<sub>y</sub>j + E<sub>k</sub> = #8211; (∂/∂xi + ∂/∂yj + ∂/∂zk)V Here, del(∂) indicates that variation is considered only in one direction (X,Y or Z).
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