A **Dipole** is a **superposition** of a
**sink** and a **source** with the same strength.

**2D dipole** with orientation angle .

**3D dipole** at the origin oriented in the
direction.

- 1.
- Question: derive the expression for a 2D dipole with orientation angle
from the superposition of a source and a sink.
- (a)
- Hint: write the superposition of a 2D source and a sink with strength a distance from each other.
- (b)
- Hint: take the limit .

- 2.
- Question: derive the expression for a 3D dipole at the origin with orientation in the
direction.
- (a)
- Hint: write the superposition of a 3D source and a sink with strength a distance from each other.
- (b)
- Hint: take the limit .

- Solution: 2D dipole with orientation angle .
- Solution: 3D dipole at the origin with orientation in the direction.