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Conductivity and Resistivity

A galvanomete...

Question

A galvanometer of resistance $50$ ohm has a sensitivity of $2$ div/mA. What is the shunt resistance required to change the sensitivity to $10$ div/mA?

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Solution

$i_{g} = i (S / S + G)$
$10 = 50 (12 / 12 + G)$
$o r 12 + G = 60$
$o r G = 48 o h m$

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