# Drawing Amperian Loops

## Prompt

“Draw an Amperian loop that you would use to calculate the magnetic field of a sheet of current. ”

## Context

This SWBQ can be done as a part of the lecture that is the introduction to the Ampere's Law Activity. It is a way to prime students for thinking about what symmetry arguments are needed.

## Wrap Up

• One that is parallel or perpendicular to field at every point and where the magnitude is constant
• $\vec{B}=\pm B(z)\, \hat{y}$ from symmetry arguments (see lecture), so want constant $z$, same infinitesimal distance ($dz$) above and below sheet

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