A voltmeter reads the potential difference across the terminals of an old battery as \( 1.40 \ma...

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A voltmeter reads the potential difference across the terminals of an old battery as \( 1.40 \mathrm{~V} \), while a potentiometer reads its voltage to be \( 1.55 \mathrm{~V} \). The voltmeter resistance is \( 280 \Omega \).
(1) The emf of the battery is \( 1.4 \mathrm{~V} \).
(2) The emf of the battery is \( 1.55 \mathrm{~V} \).
(3) The internal resistance \( r \) of the battery is \( 30 \Omega \).
(4) The internal resistance \( r \) of the battery is \( 5 \Omega \).
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