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

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

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

If the area of cross-section of a resistance wire is halved, then its resistance becomes:

When a weight of 10 kg is suspended from a copper wire of length 3 metres and diameters 0.4 mm , its length increases by 2.4 cm . If the diameter of the wire is doubled, then the extension in its length will be

When a piece of aliminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become