It is desired to measure voltage across of 100 K ohm resistor.

It is desired to measure voltage across of 100 K ohm resistor. Which out of the following four voltmeters will give most reliable results?

1. Voltmeter with sensitivity of 5 K ohm/ V
2. Voltmeter with sensitivity of 10 K ohm/ V
3. Voltmeter with sensitivity of 20 K ohm/ V
4. Voltmeter with sensitivity of 50 K ohm/ V

Higher the sensitivity of the instrument will give more accurate and reliable result.