Question

In figure, when an ideal voltmeter is connected across 4000 $\omega$ resistance, it reads 30 V. If the voltmeter is connected across 3000 $\omega$ resistance, it will read

• A. 20 V
• B. 22.5 V
• C. 35 V
• D. 40 V

Answer 1

Answer: (B)

22.5 V

Let I be the current in the circuit, then $I\times 4000=30V.$ If voltmeter is put across 3000 $\omega$ resistance, then reading of
voltmeter is $I\times 3000=\frac{30}{4000}\times 3000=22.5V$