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

The resistance of a metal wire of length 1 m is 26 Ω at 20° C. If the diameter of the wire is 0.3 mm, what will be resistivity of metal at that temperature?

The resistance of a wire of length 300 m and cross-section area 1.0 mm² made of material of resistivity 1.0 x 10^-7 Ω m is :

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

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