Current sensitivity of a galvanometer is 5 divisions per mA and its voltage sensitivity is 20 divisions per volt. Determine its resistance.
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Question

Current sensitivity of a galvanometer is 5 divisions per mA and its voltage sensitivity is 20 divisions per volt. Determine its resistance.

G1 Physics · Accepted Answer

Step 1: Current sensitivity Sᵢ = θ/I = 5 divisions/mA = 5000 divisions/A. Step 2: Voltage sensitivity Sᵥ = θ/V = 20 divisions/V. Step 3: Because V=IG, the relation is Sᵥ = Sᵢ/G. Step 4: Galvanometer resistance G = Sᵢ/Sᵥ = 5000/20 = 250 Ω. Final answer: (A) 250 Ω.