Question

What is the resistance of a wire of length of 1m, resistivity of 1.24*10^-6ohm metre and thickness of 7*10^-4m

Answer 1

Answer:

3.222ohm

Given

1. length L= 1m
2. resistivity =1.24×10^-6 ohm. metre
3. thickness d=7×10^-4 metres
4. $area = \frac{\pi}{4} \times {d}^{2}$
5. so area =3.84845×10^_7 sq. mt
6. $resitance = \frac{resistivity \times lenth}{area}$
7. so resistance=
8. $\frac{1.24 \times {10}^{ - 6} \times 1}{3.84845 \times {10}^{ - 7} }$
9. =3.22 ohms