An ideal ammeter has resistance:
AVery large
BEqual to the resistor in series
CZero
DEqual to the source EMF
Answer & Solution
Correct answer: C. Zero
1. An ammeter is placed in SERIES; it must not change the current.
2. So its internal resistance should be ZERO (ideal case).
3. By contrast, a voltmeter is in PARALLEL; its ideal resistance is INFINITE.
_Source: NCERT Class 12 Physics Ch 3 §3.10 Galvanometer to Ammeter/Voltmeter_
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