A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?

Explanation

### Step-by-Step Solution:

1. **Understanding the Composition of Water**:
- Drinking water is typically pure and contains very few dissolved substances. In contrast, seawater contains a significant amount of dissolved salts, primarily sodium chloride (table salt), along with other minerals.

2. **Electrical Conductivity**:
- The presence of dissolved salts in seawater increases its electrical conductivity. This is because salts dissociate into ions when dissolved in water, allowing the solution to conduct electricity. Drinking water, with fewer dissolved ions, has lower conductivity.

...