JEE Main 2016 Physics question
A 50 resistance is connected to a battery of 5 . A galvanometer of resistance 100 is to be used as an ammeter to measure current through the resistance, for this a resistance is connected to the galvanometer. Which of the following connections should be employed if the measured current is with in 1% of the current without the ammeter in the circuit?
Answer: (4)
Solution
An ammeter must have a *small* resistance, which is achieved by a shunt in parallel with the galvanometer — this immediately rules out the series connections in options (1) and (2). Without the ammeter the current is A. Inserting an ammeter of resistance reduces it to ,
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