Basic Galvanometer

Step 1: Use the formula for shunt resistance.
The shunt resistance can be calculated using the formula: Where:
- is the resistance of the galvanometer (500Ω),
- is the fraction of the total current passing through the galvanometer (4% or 0.04).

Step 2: Substituting the given values.
Substitute and :
Final Answer: 12.5Ω.