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Q. The resistance of an ammeter is $27\, \Omega$ and its scale is graduated for currents upto $10\, A$. After an additional shunt is connected to this ammeter it becomes possible to measure currents upto $100$ amperes by this meter. The value of shunt-resistance is :-

Current Electricity

Solution:

$90\, R=10 \times 27$
$\Rightarrow R=3\, \Omega$
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