Current Electricity

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Question 285 of 380

Wheatstone bridge principle is used to measure the specific resistance (S1)\left({S}_{1}\right) of given wire, having length LL, radius rr. If XX is the resistance of wire, then specific resistance is : S1=X(πr2L){S}_{1}=X\left(\dfrac{\pi {r}^{2}}{L}\right). If the length of the wire gets doubled then the value of specific resistance will be :

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Answer: (D) S1{S}_{1}

The specific resistance of a material, also known as electrical resistivity, is a measure of how strongly a specific material opposes the flow of electric current.
Specific resistance is an intrinsic property of a material and is dependent on factors such as the material's composition, temperature, and crystal structure. It is the counterpart of conductivity, with which it is inversely proportional.
Hence, even if the length of the wire is doubled, the specific resistance remains the same, i.e., S1{S}_{1}.

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