The deflection in moving coil galvanometer of resistance 45Ω falls from 30 divisions to 3 divisions. The length of the shunt wire required to convert galvanometer to ammeter is [specific resistance of

Question

The deflection in moving coil galvanometer of resistance 45Ω falls from 30 divisions to 3 divisions. The length of the shunt wire required to convert galvanometer to ammeter is [specific resistance of material of shunt wire = 5 × 1 0 − 7 Ω m and area of cross- section of wire = 4 × 1 0 − 7 m 2 ]

TestHub · Accepted Answer

As per the Question, I g ​ = 30 3 ​ I = 10 1 ​ I , ​ ⇒ ( I − I G ​ ) S = I G ​ G ⇒ ( I − 10 1 ​ I ) S = 10 1 ​ I G ⇒ ( 10 9 ​ ) I S = ( 10 1 ​ ) I G ⇒ 9 S = G ∴ G = 45 ∴ S = 5 ∴ S = A S L ​ ⇒ S S A ​ = L = 4 m

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