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A wire of length 10 cm and radius 7 × 10 –4 m is connected across the right gap of a meter bridge. When a resistance of 4.5 Ω is connected on the left gap by using a resistance box, the balance length is found to be at 60 cm from the left end. If the resistivity of the wire is R × 10 –7 Ω m, then value of R is

1. 35
2. 63
3. 70
4. 66

Correct answer: 66

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