The potential at a point at distance x from some charge placed on X-axis is given by
`V (x) = (20)/(x^2-4)`(in volt) The electric field at a distane x = `4mum` is given by

Options

A. `5//3 V mum^-1` (in the negative X-direction)
B. `5//3 V mum^-1` (in the postive X-direction)
C. `10//9 V mum^-1` (in the postive X-direction)
D. `10//9 V mum^-1` (in the negative X-direction)