A galvanometer’s deflection falls from 50 divisions to 25 divisions when a 12 Ω shunt is connected. What is the galvanometer’s resistance?
Correct answer C. 12Ω
Explanation
Halving the deflection means the current divides equally between galvanometer and shunt, which happens only when both resistances are equal, so the galvanometer resistance is 12 Ω.
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