As shown in the figure, the voltmeter reads 2 V across 5 Ω resistor. The resistance of the voltmeter is _________ Ω. Numerical answer type. Work it out, then open the answer.

Answer: 20. The 2 Ω resistor gets 3 - 2 = 1 V, so the total current is 1/2 = 0.5 A. Current through 5 Ω = 2/5 = 0.4 A, so the voltmeter carries 0.1 A. RV = 2/0.1 = 20 Ω

As shown in the figure, the voltmeter reads 2 V across 5 Ω resistor… | JEE Main 2023 (6 Apr, Shift 2)

Q93JEE Main 2023 · 6 APR · SHIFT 2Medium

Kirchhoff's Laws & Measuring Instruments

As shown in the figure, the voltmeter reads $2\text{ V}$ across $5\ \Omega$ resistor. The resistance of the voltmeter is _________ $\Omega$ .

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 20

The $2\ \Omega$ resistor gets $3 - 2 = 1\text{ V}$ , so the total current is $\dfrac{1}{2} = 0.5\text{ A}$ .
Current through $5\ \Omega = \dfrac{2}{5} = 0.4\text{ A}$ , so the voltmeter carries $0.1\text{ A}$ .
$R_V = \dfrac{2}{0.1} = 20\ \Omega$

Report a mistake

Kirchhoff's Laws & Measuring Instruments question from JEE Main 2023 (6 Apr, Shift 2)

More questions on Kirchhoff's Laws & Measuring Instruments