Question

Autor wire of resistance is bent in the form of a
che
De effective resistance across the points A and B is
30
2) 60
3) 7.20
The effective resistance of a number of resistors in parallel is.
When one of the resistors is burnt, the effective resistance is y. Resistance of the boat partis
oxyxy
2) .y
3)(x+y/xy)​

Answer 1

Answer:

Answer

When a wire of resistance 4R is bent in the form of circle, then the resistance of each segment across the diameter becomes 2R as shown in the figure.

Equivalent resistance between A and B:  

R  

AB

​  

 

1

​  

=  

R  

1

​  

 

1

​  

+  

R  

B

​  

 

1

​  

            (in parallel combination)

∴    

R  

AB

​  

 

1

​  

=  

2R

1

​  

+  

2R

1

​  

 

R  

AB

​  

 

1

​  

=  

2R

2

​  

                   

⟹  R  

AB

​  

=R

Explanation: