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Why electric field at the centre of a disc is not zero?

Why electric field at the centre of a disc is not zero?

Grade:12

1 Answers

Sanjay Deshmukh
27 Points
4 years ago
  1. Divide the disc into concentric rings with centre of the disc taken as common centre for all rings.
  2.  We know, electric field at the centre of a ring is 0.
  3. Hence electric field due to all the possible concentric rings at the centre would be 0.
  4. BUT
  5. There would still be a charge left due to a small point charge at the centre of the disc which would not be taken as a ring.
  6. Hence it would constitute some charge which is why electric field is generated.

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