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6. A copper wire has diameter 0.5 mm andresistivity of 1.6 × 10-8 Ω-m. What will bethe length of this wire to make its resistance10 Ω ? How much does the resistance change ifthe diameter is doubled? |
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Answer» Solution: Area of cross-section of the wire,A=π (d/2)2 Diameter= 0.5 mm = 0.0005 m Resistance,R= 10 Ω We know that ∴length of the wire = 122.72m If the diameter of the wire is doubled, new diameter=2×0.5=1mm=0.001m Let new resistance be Rʹ It's not a right answer |
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