Goal: Reason regarding induced charges and fields
Source: 283-235 Induced charge in conductors
A positive charge per unit area σ is placed on a cylindrical
conductor of inner radius, r = a, and outer radius, r = b. A positive
charge per unit length, λ, is placed along the axis of the
cylinder. What is the charge density (charge per area) on the outer
surface?
- +λ
- +σ
- -λ
- -σ
- σ+λ/(2πa)
- σ-λ/(2πa)
- σ+λ/(2πb)
- σ-λ/(2πb)
- None of the above
Commentary:
Answer
(7) The biggest problem for students is finding the induced surface
charge density due to the line charge density.