In conversion of moving coil galvanometer into an ammeter of required range, the resistance of ammeter so…

In conversion of moving coil galvanometer into an ammeter of required range, the resistance of ammeter so formed is $[\mathrm{s}=$ shunt and $\mathrm{G}=$ resistance of galvanometer $]$
  1. $\frac{S+G}{S G}$
  2. $\frac{S G}{S-G}$
  3. $\frac{S G}{S+G}$
  4. $\frac{S-G}{S G}$

Solution

$\begin{array}{l} \frac{1}{R}=\frac{1}{G}+\frac{1}{S}=\frac{G+S}{G S} \\ \therefore R=\frac{G S}{G+S} \end{array}$ *

Asked in: MHT CET 2020 (16 Oct Shift 2)

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