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Question

Which of the following wires, all made of the same material has the highest resistance


A

L=100cm,r=0.1cm

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B

L=200cm,r=0.2cm

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C

L=300cm,r=0.3cm

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D

L=400cm,r=0.4cm

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Solution

The correct option is B

L=200cm,r=0.2cm


Explanation

We know that

R=ρLA

Here, resistivity of the material remains constant.

RαLA

Among the options given, the LAratio is maximum for L=200cm

Hence, Option (B) is the correct answer.


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