A galvanometer of resistance 25Ω shows a deflection of 5 divisions when a current of 2 mA is passed through it. If a shunt of 4Ω is connected and there are 20 divisions on the scale, then the range of

Question

A galvanometer of resistance 25Ω shows a deflection of 5 divisions when a current of 2 mA is passed through it. If a shunt of 4Ω is connected and there are 20 divisions on the scale, then the range of the galvanometer is

TestHub · Accepted Answer

There are 20 divisions on scale. Initially, current for 20 divisions = 5 2 × 20 ​ = 8 mA ∴ ∵ ​ I g = 8 mA I I g ​ = S + G S ​ ​ ⇒ I ​ = ( S S + G ​ ) I g ​ ⇒ I = ( 4 4 + 25 ​ ) × 8 = 29 × 2 = 58 mA ​

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