\( \mathrm{P} \) circuit is \( 75.8 \mathrm{~cm} \). When a resisto...

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\( \mathrm{P} \) circuit is \( 75.8 \mathrm{~cm} \).
When a resistor of \( 10.2 \Omega \) is used in the external circuit of the cell the balance point shifts to \( 68.3 \mathrm{~cm} \) length of the potentiometer wire. The internal resistance of the cell is
(a) \( 2.5 \Omega \)
(b) \( 2.25 \Omega \)
(c) \( 1.12 \Omega \)
(d) \( 3.2 \Omega \)
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