The electric potential V as a function o...

The electric potential V as a function of distance x(in metre) is given by `V= (2x^(2) + 5x-9)V`
The value of electic field at x=1m would be

A

9 V/m

B

`-9` V/m

C

`-7` V/m

D

`-2` V/m

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The correct Answer is:

B

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