NEET 2007 Physics question
The resistance of an ammeter is and its scale is graduated for a current upto 100 Amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 Amperes by this meter. The value of shunt-resistance is
Answer: (3)
Solution
With a shunt in parallel with the ammeter of resistance , the full-scale meter current A flows through the meter when the total current is A. The potential difference across both is the same:
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