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How dA came??? It is the question of calculate the electric potential due to a uniformly charged disc at a point on its axis?? Please explain
question image
Asked by valavanvino1011 | 29 May, 2019, 18:12: PM
answered-by-expert Expert Answer
If Area A = πx2 , then dA is obtained by direct differentiation  as  dA = 2 π x dx 
 
In the given calculation same expression is obtained for dA by neglecting (dx)2 since it will be negligibly small
Answered by Thiyagarajan K | 30 May, 2019, 15:01: PM

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