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

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25 Ω

30 Ω

60 Ω

45 Ω

answer is C.

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Detailed Solution

The resistivity of nichrome is 60 times increased than the resistivity of copper. So similarly nichrome wire will have a resistivity of

60 Ω

. Nichrome is an alloy of nickel, chromium, manganese and iron. The resistivity of a substance depends on the nature of the substance and temperature. The resistivity of a substance is its characteristic property. So, we can utilize the resistivity values to compare the resistances of two or more substances.

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