Give two examples of polar dielectrics.

Explanation

### Step-by-Step Solution

1. **Understanding Polar Dielectrics**:
- A polar dielectric is a type of dielectric material that consists of polar molecules. These molecules have a permanent electric dipole moment, which means they have a positive charge center and a negative charge center that do not coincide.

2. **Defining Polar Molecules**:
- Polar molecules are characterized by their dipole moment, which is a measure of the separation of positive and negative charges within the molecule. For a molecule to be considered polar, it must have a non-zero dipole moment.

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