What are the dimensions of `mu_0//4pi`?

Explanation

To find the dimensions of \(\frac{\mu_0}{4\pi}\), we start by understanding the context in which \(\mu_0\) is used. The term \(\mu_0\) is known as the permeability of free space, and it appears in the formula for the magnetic field due to a current-carrying conductor.

### Step-by-Step Solution:

1. **Identify the formula involving \(\mu_0\)**:
The magnetic field \(B\) due to an infinite straight conductor carrying current \(I\) is given by:
\[
B = \frac{\mu_0}{4\pi} \cdot \frac{I \cdot dl \cdot \sin \theta}{r^2}
...