Two wires A and B, are both made of copper. Both wires are 1m long but wire A is 1mm thick and wire B is 2mm thick. What is the ratio of their resistivities? Justify.
Resistivity only depends on the nature and temperature of the wire. As resistivity is an intrinsic property of the wire, it means that it doesn't depend on the dimensions of the wire. Hence resistivity does not change with the change in the thickness of the wire.
Answers & Comments
Answer:
the wire A has more resistance as the resistance of a given material will increase with the length, but decrease with increasing cross-sectional area.
Answer:
both A and B.
Resistivity only depends on the nature and temperature of the wire. As resistivity is an intrinsic property of the wire, it means that it doesn't depend on the dimensions of the wire. Hence resistivity does not change with the change in the thickness of the wire.