If the diameter of a resistance wire is halved, then its resistance becomes:

When the diameter of a wire is doubled, its resistance becomes:

If the resistance of a certain copper wire is 1Ω, then the resistance of a similar nichrome wire will be about:

The resistivity of a certain material is 0.6 Ωm. The material is most likely to be:

When the area of cross-section of a conductor is doubled, its resistance becomes: