A voltmeter with a resistance 50 × 10 3 Ω is used to measure voltage in a circuit. To increase its range to 3 times, the additional resistance to be put in series is

Question

A voltmeter with a resistance 50 × 10 3 Ω is used to measure voltage in a circuit. To increase its range to 3 times, the additional resistance to be put in series is, 9 × 10 6 Ω, 10 5 Ω, 1.5 × 10 5 Ω, 9 × 10 5 Ω

MARKS App · Accepted Answer

V = i g R a n d V ′ = i g R ′ o r R ′ R = V ′ V Or R ′ = V ′ V R = 3 V V × 50 × 10 3 = 1.5 × 10 5 Ω ∴ Additional resistance = 1.5 × 10 5 - 0.5 × 10 5 = 10 5 Ω

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