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A 35 V source is connected to a series circuit at 600 ohms and R as shown. If a voltmeter at internal resistance 1.2 kilo ohms is connected across 600 ohm resistor it reads 5 V. The value of R is ______k Ω .
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- 1.4 kΩ
- 2.0 kΩ
- 2.4 kΩ
- None of these
Correct Option: C
When voltmeter of 1.2 kΩ meter resistance is connected across 600 Ω , then
| net resistance becomes | = 400 Ω | |
| 600 × 1200 |
Voltage across this is 5 V and therefore voltage across R is 35 – 5 = 30 V
| ∴ | = | = | ||||
| 400 | V | 5 |
⇒ R = 2.4 kΩ
