The variation of electrostatic potential with radial distance r from centre of a positively charged metallic thin shell of radius R is given by which graph? [Diagram: Image]
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Question

The variation of electrostatic potential with radial distance r from centre of a positively charged metallic thin shell of radius R is given by which graph? [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: The electric field inside a charged conducting shell is zero, so potential inside is constant V = kQ/R. Step 2: Outside the shell V(r) = kQ/r, decreasing inversely with r. Step 3: Therefore the graph is horizontal for 0 ≤ r ≤ R and follows 1/r for r > R: option B.