What is the potential energy of a magnetic dipole when it is placed perpendicular to the magnetic field?

Explanation

To find the potential energy of a magnetic dipole when it is placed perpendicular to the magnetic field, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Formula for Potential Energy**:
The potential energy (U) of a magnetic dipole in a magnetic field is given by the formula:
\[
U = -\vec{m} \cdot \vec{B}
...