A galvanometer having 20 division scale and 50 Ω resistance is connected in series to a cell of e.m.f. 1.5 V through a resistance of 100 Ω, shows full scale deflection. The figure of merit of the galvanometer in microampere/division is
Total resistance = 100 Ω + 50 Ω = 150 Ω.
Current = 1.5 V / 150 Ω = 0.01 A = 10,000 µA.
For 20 divisions, current per division = 10,000 µA / 20 = 500 µA/div.
Answer: (C) 500.
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Total resistance in the circuit = 100Ω + 50Ω = 150Ω
Current through the galvanometer at full scale deflection:
I = V/R = 1.5/150 = 0.01A = 10, 000µA
Galvanometer has 20 divisions, so:
Figure of merit = 10, 000µA/20 = 500 μA/division
Answer: (C) 500.
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