When an ammeter of negligible internal resistance is inserted in series with circuit, it reads \...

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When an ammeter of negligible internal resistance is inserted in series with circuit, it reads \( 1 \mathrm{~A} \). When a voltmeter of very large resistance is connected across \( R_{1} \), it reads \( 3 \mathrm{~V} \). But when the points \( A \) and \( B \) are short-circuited by a conducting wire, then the voltmeter measures \( 10.5 \mathrm{~V} \) across the battery. The internal resistance of the battery is equal to
(1) \( \frac{3}{7} \Omega \)
(2) \( 5 \Omega \)
(3) \( 3 \Omega \)
(4) none of these
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