In a potentiometer experiment, the balancing length with a cell in the secondary circuit is foun...

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In a potentiometer experiment, the balancing length with a cell in the secondary circuit is found to be \( 480 \mathrm{~cm} \). When a resistor of \( 8 \mathrm{ohm} \) is connected in parallel to the cell, the balăncing length is found to be \( 420 \mathrm{~cm} \). The internal resistance of the cell is
a. \( 1.14 \Omega \)
b. \( 2 \Omega \)
c. \( 4.12 \Omega \)
d. \( 56 \Omega \)
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