Question

Calculate the length of wire of resistance of 10ohm and area of cross section 0.5 cm in S.I. units. The specific resistance of wire is 0.0008 ohm-cm ​

Answer 1

Answer:

Step-by-step explanation:

Given, Diameter=0.5mm,resistivity=1.6×10  

−8

Ω−m,resistance=10Ω

we know that R=ρ  

A

1

​  

⇒1=  

ρ

RA

​  

 

Where A is the area of the cross-section,

=  

1.6×10  

−8

 

10×3.14×(  

2

0.0005

​  

)  

2

 

​  

=122.7m

Thus the length of the wire is 122.7