Q27 of 330 Page 27

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

Alloy of nickel, chromium, manganese and iron having a resistivity of about 60 times more than that of copper.

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25

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 :

 26

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

 28

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

 29

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