Question

The electrical resistivities of three materials A, B and C are $2.5\times {10}^{15}m,3.8\times 1O^{-8}mand3.5\times {10}^{4}m$ respectively. Which material should be used formaking electric wires?

• A. A
• B. B
• C. C
• D. None of these

Answer 1

The correct option is B B

Answer is B.
Electrical resistivity is an intrinsic property that quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. It is defined as the resistance per unit length of the resisting material.
Electric wires are made of material that have a very less electrical resistivity.
In the given examples, material B has the least resistivity (mind the exponential power with a negative sign), which means that more current can flow through it.
Hence, material B should be used for making electric wires.