Correct option is B
The internal resistance of measuring instruments like ammeters and voltmeters is crucial for their proper functioning. Here's an explanation of the ideal conditions for both:
· Ideal Ammeter: An ideal ammeter is designed to measure current without affecting the circuit it is measuring. To achieve this, it should have zero internal resistance. This way, it does not add any additional resistance to the circuit, ensuring that the current remains unchanged.
· Ideal Voltmeter: An ideal voltmeter is designed to measure voltage across two points without drawing any current from the circuit. To achieve this, it should have infinite internal resistance. This way, it does not allow any current to flow through it, ensuring that the voltage it measures is accurate and not affected by the meter itself.
Therefore, the correct answer is zero; infinite.
