Question

What charge is enclosed by a coaxial cylinder of length \[l\] around a wire with linear charge density \[\lambda\]?

Options

• \[Q_{\mathrm{enc}} = \lambda l\]

• \[Q_{\mathrm{enc}} = 2\pi r l\]

• \[Q_{\mathrm{enc}} = \lambda/l\]

• \[Q_{\mathrm{enc}} = \lambda r\]

Answer 1

Linear charge density is charge per unit length. A cylinder enclosing wire length \[l\] therefore encloses charge \[Q_{\mathrm{enc}} = \lambda l\].