Q.A long cylindrical shell carries positive surface charge $\sigma$ in the upper half and negative surface charge $-\sigma$ in the lower half. The electric field at a point on the axis at a distance $x$ from centre is (JEE Advanced 2019)

\dfrac{\sigma}{\epsilon_0} \hat{j}

\dfrac{2\sigma}{\epsilon_0} \hat{j}

\dfrac{\sigma}{\pi \epsilon_0} \hat{j}

Zero

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.A long cylindrical shell carries positive surface charge σ\sigmaσ in the upper half and negative surface charge −σ-\sigma−σ in the lower half. The electric field at a point on the axis at a distance xxx from centre is (JEE Advanced 2019)