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Find out vecE at x = 4 if the potential ...

Find out `vecE` at x = 4 if the potential at a point x due to some charges situated on x-axis is `v_((x))=(20)/((x^2-4))V:`

A

`9/10V//mum`

B

`18/12V//mum`

C

`80/120V//mum`

D

`10/9V//mum`

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