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A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are VA, VB and VC respectively. Then
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- VA ≠ VB = VC
- VA = VB ≠ VC
- VA ≠ VB ≠ VC
- VA = VB = VC
Correct Option: D
Effective resistance of B and C
| = | RB . RC | = | 1.5 R × 3R | = | 4.5R² | = R | |
| RB + RC | 1.5R +3R | 4.5R |
i.e., equal to resistance of voltmeter A.
In parallel potential difference is same so, VB = VC and in series current is same
So, VA = VB = VC
