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A battery of $e.m.f.$ $3\, volt$ and internal resistance $1.0\, ohm$ is connected in series with copper voltameter. The current flowing in the circuit is $1.5\, amperes$. The resistance of voltameter will be ........... $ohm$
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(b) $3 = 1.5\,(1 + r)$ $ \Rightarrow $ $r = 1$ $\Omega$
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