There are three voltmeters of the same range but of resistance `10000 Omega, 8000 Omega` and `4000 Omega` respectively. The best voltmeter among these is the one whose resistance is

Options

A. 10000 omega
B. 8000
C. 4000
D. all are equally good

Explanation

To determine the best voltmeter among the three given options based on their resistances, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Role of Resistance in Voltmeters:**
- Voltmeters are designed to measure the potential difference across two points in a circuit without significantly affecting the circuit itself. This is achieved by having a high resistance.

2. **List the Given Resistances:**
- The resistances of the three voltmeters are:
- V1 = 10,000 Ω
- V2 = 8,000 Ω
- V3 = 4,000 Ω

3. **Analyze the Effect of Resistance on Current:**
- A voltmeter with higher resistance draws less current from the circuit. This is important because if a voltmeter draws too much current, it can alter the voltage it is supposed to measure.

4. **Identify the Highest Resistance:**
- Among the three voltmeters, the one with the highest resistance is V1 (10,000 Ω).

5. **Conclusion:**
- Since the voltmeter with the highest resistance will cause the least disturbance in the circuit and provide a more accurate measurement, the best voltmeter among the three is the one with a resistance of **10,000 Ω**.

### Final Answer:
The best voltmeter among these is the one whose resistance is **10,000 Ω**.

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