19. if the potential field is given by v (x, y, z) = 2x*y - 5z, the magnitude of the electric field intensity at the point p (1,2, 3) is (a) 11v (c) 9.6 v (b) -

19. If the potential field is given by V (x, y, z) = 2x*y - 5z, the magnitude of the electric field intensity at the point P (1,2, 3) is (A) 11V (C) 9.6 V (B) -11 V/m (D) 9.6 V/m