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A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance Rx. A voltmeter having a resistance of 1.2 k-ohm is connected across 600 ohm resistance and reads 5V. The value of resistance Rx will be _________kΩ
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- 2.4
- 2.1
- 2.5
- 2.9
Correct Option: A
Voltage across R1, V1 = 35 – 5 = 30V 
| Current in the circuit, I = | = | A | |||
| 400 | |||||
| 600 + 1200 | |||||
| ∴ Rx = | = 2.4 kΩ | |
| 5 |
