A current of 2 A flows through a \( 2 \Omega \) resistor when \( \mathrm{P} \) connectedacrossa ...

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A current of 2 A flows through a \( 2 \Omega \) resistor when
\( \mathrm{P} \) connectedacrossa battery. The same battery supplies a current of \( 0.5 \mathrm{~A} \) when connected across a \( 9 \Omega \) resistor The internal resistance of the battery is :-
(1) \( 0.5 \Omega \)
(2) \( 1 / 3 \Omega \)
(3) \( 1 / 4 \Omega \)
(4) \( 1 \Omega \)
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