Question

The potential at a point x (measured in $\mu m$ ) due to some charges situated on the x -axis is given by $V\left(x\right)=\frac{20}{(x^2-4)}$ volt. The electric field $E$ at $x=4\mu m$ is given by

• A. $\left(\frac{10}{9}\right)V\mu m^{-1}$ and in the +ve x direction
• B. $\left(\frac{5}{3}\right)V\mu m^{-1}$ and in the -ve x direction
• C. $\left(\frac{5}{3}\right)V\mu m^{-1}$ and in the +ve x direction
• D. $\left(\frac{10}{9}\right)V\mu m^{-1}$ and in the -ve x direction

Answer 1

Answer: (A)