A thin uniformly charged disc can be imagined as a

A

discrete collection of concentric rings

B

continuous collection of concentric rings

C

discrete collection of chords

D

continuous collection of chords

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Solution

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Correct option is B)

A thin uniformly charged disc can be assumed to be made of continuous collection of concentric rings. Electric field at a point is then calculated due to any one such ring and then it is integrated over all the rings to find the electric field due to whole charged disc.