The resistance of a galvanometer is $50\, ohm$ and the maximum current which can be passed through it is $0.002\, A$. What resistance must be connected to it in order to convert it into an ammeter of range $0 -0.5\, A$ ?....$ohm$
JEE MAIN 2019, Medium
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since shunt resistance is connected in parallel with galvanometer, both will have same voltage drop.
$(0.002)\left(R_{G}\right)=(0.5-0.002)\left(r_{s}\right)$
$\Rightarrow r_{s} \approx 0.2\, \Omega$
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