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Q.

Is it true that the resistance of a wire varies with its area of cross-section?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
From the resistance formula, it is known that “the resistance of a wire is inversely proportional to the area of cross-section and directly proportional to the length and resistivity of the material.” Hence, the resistance of a wire varies inversely with its cross-section area. Mathematically,
R∝1Area of cross section
  
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