Two wires are of same length and radius but one of them is copper and the other is of iron. Which will have more resistance (Given resistivity of copper $= 1.62 \times 10^{- 8}$ ohm meter and resistivity of iron $= 10 \times 10^{- 8}$ ohm meter

Open in App

Solution

We know that
Resistance, $R = ρ \frac{L}{A}$
$R \propto ρ$ (If length and area is same)
So, more the resistance more is the resistivity Fif length and area of cross section remain the same
Thus, Iron has a higher resistance

Suggest Corrections

Similar questions

Q. Equal potentials are applied on an iron and a copper wire of same length. In order to have the same current flow in the two wires, the ratio r (iron) /r (copper) of their radii must be: [Give that: specific resistance of iron

= 1.0 \times 10^{- 7}

ohm-m and specific resistance of copper

= 1.7 \times 10^{- 8}

ohm-m]

Two wires, one of copper and other of iron, are of the same length oand same readius. Which will have more resistance? Give reason.
Specific resistance of iron is more than that of copper.

Q. Calculate the resistance of

1 k m

long copper wire of area of cross section

2 \times 10^{- 2} {c m}^{2}

. The resistivity of the copper wire is

1.62 \times 10^{- 8} o h m - m e t r e

Join BYJU'S Learning Program

Two wires are of same length and radius but one of them is copper and the other is of iron. Which will have more resistance (Given resistivity of copper =1.62×10−8 ohm meter and resistivity of iron =10×10−8 ohm meter

We know thatResistance, R=ρLAR∝ρ (If length and area is same)So, more the resistance more is the resistivity Fif length and area of cross section remain the sameThus, Iron has a higher resistance

Two wires are of same length and radius but one of them is copper and the other is of iron. Which will have more resistance (Given resistivity of copper $= 1.62 \times 10^{- 8}$ ohm meter and resistivity of iron $= 10 \times 10^{- 8}$ ohm meter

We know that
Resistance, $R = ρ \frac{L}{A}$
$R \propto ρ$ (If length and area is same)
So, more the resistance more is the resistivity Fif length and area of cross section remain the same
Thus, Iron has a higher resistance