Question

In a closed circuit, the resistance of a resistor is 2 ohm. Find the resistance if: a)Length of wire is doubled b) Area of cross section is doubled c) Area of cross section is halved

Answer 1

Answer:

We know  

R=ρ  

A

l

​  

 , now area becomes half and length is double .

R  

1

​  

=ρ  

2

A

​  

 

2l

​  

=ρ  

A

4l

​  

4r