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