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- PHY102 Physics II © Dr.Cem Özdoğan
- 1) Define: We can mentally divide the ring into differential elements of charge that are so small that they are like point charges, and then we can apply to each of them.
- 22-6 The Electric Field due to a Continuous Charge
- This differential charge sets up a differential electric field dE at point P, a distance r from the element.
- 2) Adding: Next, we can add the electric fields set up at P by all the differential elements.
- The vector sum (Σ→ ∫) of the fields gives us the field set up at P by the ring.
- Let ds be the (arc) length of any differential element of the ring.
- Since is the charge per unit (arc) length, the element has a charge of magnitude