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- Homework Statement
- A disk of radius R has a uniform surface charge density s. Calculate the electric field at a point P that lies along the central perpendicular axis of the disk and a distance x from the center of the disk

- Relevant Equations
- Continuous charge distribution formula

Hi!

For this problem,

Why is the area of each ring segment dA equal to (2π)(r)(dr)?

However, according to google the area of a ring segment (Annulus) is,

Many thanks!

For this problem,

Why is the area of each ring segment dA equal to (2π)(r)(dr)?

However, according to google the area of a ring segment (Annulus) is,

Many thanks!