A battery is connected to a potentiometer and a balance point is obtained at \( 84 \mathrm{~cm} ...

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A battery is connected to a potentiometer and a balance point is obtained at \( 84 \mathrm{~cm} \) along the wire. When its terminals are connected by a \( 5 \Omega \) resistor, the balance point changes to \( 70 \mathrm{~cm} \).
Calculate the internal resistance of the cell.
(1) \( 4 \Omega \)
(2) \( 2 \Omega \)
(3) \( 5 \Omega \)
(4) \( 1 \Omega \)
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