Electric potential at any point is $V = - 5x + 3y + \sqrt {15} z$, then the magnitude of the electric field is
Electric potential at any point is $V = - 5x + 3y + \sqrt {15} z$, then the magnitude of the electric field is
- A
$3\sqrt 2 $
- B
$4\sqrt 2 $
- C
$5\sqrt 2 $
- D
$7$
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