The current sensitivity of a moving coil galvanometer increases by `20%` when its resistance is increased by a factor 2. Calculate by what factor does the voltage sensitivity change?

Explanation

To solve the problem, we need to analyze the relationship between current sensitivity, voltage sensitivity, and resistance in a moving coil galvanometer.

### Step-by-Step Solution:

1. **Understanding Current Sensitivity**:
- The current sensitivity (S) of a galvanometer is defined as the deflection per unit current.
- Initially, let the current sensitivity be \( S_0 \) and the initial current be \( I_0 \).

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