The potential of the electric field produced by point charge at any point (x, y, z) is given by `V = 3x^(2) + 5` , where x ,y are in are in metres and V is in volts. The intensity of the electric field at (-2,1,0) is :
A
- 17 V/m
B
+ 12 V/m
C
- 17 V/m
D
- 12 V/m
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