We are given three copper wires of different lengths and different areas of cross-section. Which one of the following would have highest resistivity?
- A.Copper wire of 50 cm length and 1 mm diameter
- B.Copper wire of 25 cm length and 0.5 mm diameter
- C.Copper wire of 10 cm length and 2.0 mm diameter
- D.All the wires would have same resistivity
Show answer
Resistivity is a property of the material and its temperature, not of the wire's shape, so every copper wire has the same resistivity.
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