JEE Main 2016 Physics question
A galvanometer having a coil resistance of gives a full scale deflection, when a current of mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of A, is:
Answer: (3)
Solution
To make an ammeter, a low shunt resistance is placed in parallel with the galvanometer so that most of the current bypasses the coil. The voltage across the parallel combination is common:
= (I - ⇒ S =
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