Chapter 16, Problem 16.6YT

Interpretation Introduction

Interpretation:

In Figure $\text{16-10}$, a local magnetic field line oriented in the same direction as the ${\text{B}}_{\text{ext}}$ is to be identified.

Concept introduction:

The direction of the magnetic field at any point is parallel to the direction of the nearby field lines, and the local density of field lines can be made proportional to its strength.