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Carey Foster's Bridge to Measure Specific Resistance of Material

1. The value of the balancing length l₁ when the unknown resistance is connected across AB and a resistance of 5 ohms is taken out from the resistance box

a: 48 cm b: 49 cm c: 47 cm d: 46 cm

2. Specific resistance of manganin wire is of the following order?

a: 4.33 x10 <sup>-5</sup> Ohm.cm b: 4.33 x10 <sup>-7</sup> Ohm.cm c: 4.33 x10 <sup>-9</sup> Ohm.cm d: 4.33 x10 <sup>-5</sup> Ohm.m

3. Specific resistance of Constantan wire is approximately:

a: 4.33 x10<sup>-7</sup> Ohm.cm b: 4.33 x10<sup>-5</sup> Ohm.cm c: 4.33 x10<sup>-9</sup> Ohm.cm d: 4.33 x10<sup>-5</sup> Ohm.m

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