Question

If the area of an iron rod is 10 cm by 0.5 cm and length is 35 cm. Find the value of resistance, if 11x10^-8 ohm.m be the resistivity of iron.

Answer 1

Resistance of the iron rod, R = 0.000077 ohms

Step-by-step explanation:

It is given that,

Area of iron rod,
`A=10\ cm* 0.5\ cm=5\ cm^2 = 0.0005\ m^2`

Length of the rod, L = 35 cm = 0.35 m

Resistivity of Iron,
`\rho=11* 10^(-8)\ \Omega-m`

We need to find the resistance of the iron rod. It is given by :

`R=\rho(L)/(A)`

`R=11* 10^(-8)* (0.35\ m)/(0.0005\ m^2)`

`R=0.000077 \Omega`

So, the resistance of the rod is 0.000077 ohms. Hence, this is the required solution.