What is current sensitivity? State ita SI unit.

Explanation

**Step-by-Step Solution:**

1. **Definition of Current Sensitivity:**
Current sensitivity refers to the ability of a galvanometer to produce a deflection in its needle for a given amount of current passing through it. It is a measure of how responsive the galvanometer is to the current flowing through its coil.

2. **Mathematical Expression:**
The current sensitivity (S) can be mathematically expressed as:
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