A galvanometer has a coil of resistance with a full scale deflection at The value of resistance to be added to use it as an ammeter of range is

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Solution

Q.
A galvanometer has a coil of resistance $200 Ω$ with a full scale deflection at $20$ $μ A .$ The value of resistance to be added to use it as an ammeter of range $(0 - 20)$ $m A$ is [2024]

1 $0.40 Ω$

2 $0.20 Ω$

3 $0.50 Ω$

4 $0.10 Ω$

Ans.
(2)

$G = 200$ $Ω$ and $i_{g} = 20$ $μ A$

   $i = i_{g} (\frac{G}{S} + 1)$

   $\Rightarrow 20 \times 10^{- 3} = 20 \times 10^{- 6} (\frac{200}{S} + 1)$

   $\Rightarrow \frac{200}{S} = 999 \Rightarrow S \approx 0.2 Ω$

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