A galvanometer having a resistance of 20 Ω and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 V , is:

Question

A galvanometer having a resistance of 20 Ω and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 V , is:, 120 Ω, 100 Ω, 80 Ω, 125 Ω

MARKS App · Accepted Answer

Current for full scale deflection = 0.005 × 30 = 0.150 A Voltage for full scale deflection = 0.150 × 20 V = 3.0 V Resistance required to be connected in series = 15 3 - 1 20 Ω = 80 Ω

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