Question

Two wires are of same length and radius but one of them is of copper and other is of iron . whichwill have more resistance?

Answer 1

Answer:

Iron will have more resistance.

Explanation:

As the length and area of both copper wire and Iron wire are same. The third thing on which resistance is dependent is the resistivity (rho). The resistivity is directly proportional to the resistance. The resistivity of Iron is more than copper. Hence Iron will have more resistance.

Answer 2

Answer:

RESISTANCE : it is the barrier offered by the atoms of an element to the flow of free electrons.

resistance = [ resistivity × length] ÷ area

resistivity of iron = 9.71 × 10^-8

resistivity of copper = 1.72 × 10^-8

Here we have given that length and area of both the wires are same.

So,

as resistance is directly proportional to the resistivity, {greater the resistivity greater the resistance}.

Hence IRON has more resistance.