The potential of the electric field produced by a point charge at any point (x, y, z) is given by V = 3x2 + 5, where x, y, z are in metres and V is in volts. The intensity of the electric field at (-2, 1, 0) is
1
-12 Vm-1
2
+12 Vm-1
3
-17 Vm-1
4
+17 Vm-1