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The potential at a point distant x (mesu...

The potential at a point distant x (mesured in `mum` ) due to some charges situated on the x-axis is given by `V (x)=(20)/(x^(2)-4)` V. The electric field at `x=4 mum` is given by

A

5/3 volt/`mu` m and in the negative x direction

B

5/3 volt/ `mu` m and in the positive x direction

C

10/9 volt/ `mu` m and in the negative x direction

D

10/9 volt/`mu` m and in the positive x direction

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The correct Answer is:
D
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