For a uniformly charged non conducting solid cylinder of infinite length, which of the following graph shows the variation of E with r ? (distance from axis)
Answer & explanation
Correct answer: option 2
Case 1: Inside the cylinder $(r<R)$
$E=\frac{ρr}{2ε_0}$
[$ρ$ = Charge density]
$⇒ E \propto r $
Case 2: Outside the cylinder $(r>R)$
$E=\frac{ρR^2}{2ε_0r}$
$⇒ E \propto \frac{1}{r} $
