In the diagram shown, the reading of voltmeter is $20\, V$ and that of ammeter is $4\, A$. The value of $R$ should be (Consider given ammeter and voltmeter are not ideal)
Medium
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If resistance of ammeter is $r$ then
$20 = (R + r)4$ $ \Rightarrow $ $R + r = 5$ $ \Rightarrow $ $R < 5\,\Omega $
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