Q. 234.6( 16 Votes )

Figure 3.34 shows

Answer :

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,

r=(78.3-64.8)/64.8× 9.5
 =0.177 × 9.5
 =1.685  Ω

Therefore, the value of the unknown resistance, X, is 1.685  Ω.

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