The electric potential V is given as a function of distance x (metre) by V=(5x2 + 10x - 9) volt . Value of electric field at x = 1 is
20 V/m
6 V /m
11 V/m
-23 V/m
E=-dVdx=-ddx5x2+10x-9=-10x-10 ∴(E)x=1=-10×1-10=-20 V/m