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Dear Student ,
Here is a link which will help you to solve this question with proper explanation .
https://www.meritnation.com/ask-answer/question/an-annular-disc-of-inner-radius-a-and-outer-radius-b-is-u/electric-charges-and-fields/11987803
Regards
Here is a link which will help you to solve this question with proper explanation .
https://www.meritnation.com/ask-answer/question/an-annular-disc-of-inner-radius-a-and-outer-radius-b-is-u/electric-charges-and-fields/11987803
Regards