Balance point for open circuit, l1 = 78.3 cm
Resistance of the external resistor, R = 9.5 Ω
Balance point for this resistor, l2 = 64.8 cm
The relation connecting internal resistance r and balance point is,
=0.177 × 9.5
Therefore, the value of the unknown resistance, X, is 1.685 Ω.
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