Q.

If electric potential at any point is V = -5x + 3 y + 15z, where V, x, y and z are in SI units, then the magnitude of the electric field (in SI unit) is

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a

32

b

42

c

52

d

7

answer is D.

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Detailed Solution

Ex=-dVdx=-(-5)=5;Ey=-dVdy=-3  and Ez=-dVdz=-15 Enet=Ex2+Ey2+Ez2=(5)2+(-3)2+(-15)2=7
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