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CUET
Physics
Electrostatic Potential and Capacitance
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$ E = -\frac{dV}{dx} = -\frac{20\times -2x}{(x^2-4)^2}$
$ \text{ At x = }4\mu m , E = \frac{10}{9} V/\mu m $
$\text{E is along +ve X-Axis}$