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If V = 2x^2y – 5z, find its electric field at point (-4,3,6)(a) 47.905(b) 57.905(c) 67.905(d) 77.905The question was posed to me in quiz.This intriguing question comes from Line Integral topic in section Vector Calculus of Electromagnetic Theory

Answer»

The CORRECT choice is (b) 57.905

To explain I WOULD SAY: E = -GRAD (V) = -4xy i – 2×2 j + 5k

At (-4,3,6), E = 48 i – 32 j + 5 k, |E| = √3353 = 57.905 units.



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