A potential field is given by V 5 3x2 y 2 yz. Which of the following is not true? (a) At point 11, 0, 212, V and E vanish. (b) x2 y 5 1 is an equipotential line on the xy-plane. (c) The equipotential surface V 5 28 passes through point P2, 21, 42. (d) The electric field at P is 12ax 2 8ay 2 az V/m. (e) A unit normal to the equipotential surface V 5 28 at P is 20.83ax 1 0.55ay1 0.07az.
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