Question

What Gaussian surface is used for an infinite line charge?

Options

• A coaxial cylinder of radius \[r\] and length \[l\]

• A cylinder whose axis is perpendicular to the wire

• A rectangular pillbox of area \[A\]

• A concentric sphere of radius \[R\]

Answer 1

The Gaussian surface is a coaxial cylinder with radius \[r\] and length \[l\]. Its axis lies along the infinitely long wire.