Define electric dipole moment. Write its SI unit ?

Explanation

### Step-by-Step Solution:

1. **Definition of Electric Dipole Moment**:
- An electric dipole moment is defined as the measure of the separation of positive and negative charges in a system. It is a vector quantity that points from the negative charge to the positive charge.

2. **Mathematical Expression**:
- The electric dipole moment (\( \vec{p} \)) can be mathematically expressed as:
\[
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