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Q.

A moving coil galvanometer can measure a current of 10^–6A. What is the resistance of shunt required if it is to measure 1A ?

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Detailed Solution

$i_{g} = 10^{- 6} A; i = 1 A$
shunt $S = \frac{G}{\frac{i}{1_{g}} - 1}$
$S = \frac{G}{\frac{1}{10^{- 6}} - 1}$
$S \approx G 10^{- 6} Ω$

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A moving coil galvanometer can measure a current of 10–6A. What is the resistance of shunt required if it is to measure 1A ?