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A 35 V d.c. supply is connected across a combined resistance of 600 ohms and an unknown resistance of R ohms in series. A voltmeter having a resistance of 1.2 kW is connected across 600 ohm resistor and reads 5 V. The resistance R will be
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- 120 ohms
- 500 ohms
- 1.7 k ohms
- 2.4 k ohms
Correct Option: D
Parallel sum of 600 ohm and 1200 ohm
| = | = 400 ohm | |
| 1800 |
| ∴ | = | ||
| 35.5 | 5 |
or R = 2400 ohms = 2.4 k ohms
