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Q.

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


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a

25 Ω

b

30 Ω

c

60 Ω

d

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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