A potential field is given by V = 3x 2 y yz. Which of the following

Question:

A potential field is given by V = 3x²y – yz. Which of the following is not true?
(a) At point (1, 0, –1), V and E vanish.
(b) x²y = 1 is an equipotential line on the xy-plane.
(c) The equipotential surface V = 28 passes through point P + 2, –1, 4).
(d) The electric field at P is 12a_x– 8a_y – a_zV/m.
(e) A unit normal to the equipotential surface V = –8 at P is –0.83a_x + 0.55a_y+ 0.07a_z.