The magnitude of electric field $E$ in the annular region of a charged cylindrical capacitor
IIT 1996, Easy
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(c) The magnitude of electric field in the annular region of a charged cylindrical capacitor is given by $E = \frac{1}{{2\pi {\varepsilon _0}}}\frac{\lambda }{r}$ where $\lambda$ is the charge per unit length and $r$ is the distance from the axis of the cylinder. Thus $E \propto \frac{1}{r}$
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