Answer:
a
  Solid Wire      
      
   Stranded  Wire  
b
   Solid Wire    
 
    Stranded  Wire   
 
Explanation:
Considering the first question 
From the question we are told that 
   The  radius of the first wire is  
   The radius of  each strand is  
   The current density in both wires is  
Considering the first wire 
      The  cross-sectional area of the first wire is 
       
= >   
 
= >   
 
Generally the current in the first wire is    
      
=>  
=>   
 
Considering the second wire  wire 
The  cross-sectional area of the second wire is 
      
=>     
=>  
Generally the current is   
       
=>    
=>    
Considering question two  
  From the question we are told that 
      Resistivity is  
      The  length of each wire  is  
Generally the resistance of the first wire is mathematically represented as 
      
 
=>  
 
=>  
 
Generally the resistance of the first wire is mathematically represented as 
      
 
=>  
 
=>  
 
 
        
             
        
        
        
It will be 80 miles and it can be done only in 16 min
        
                    
             
        
        
        
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Answer:
The distance in kilometers is 4012 × km.
 km.
Explanation:
We know that the conversion of 1 millimeters is equal to  meter. And then the conversion of 1 meter is equal to
 meter. And then the conversion of 1 meter is equal to  km. Then the conversion of 1 millimeter to km will be
 km. Then the conversion of 1 millimeter to km will be 
1 mm =  m
 m
1 m =  km
 km
So, 1 mm =  ×
× km =
 km =  km.
 km.
As here the the distance is 4012 mm, then the distance in km will be 
4012 mm = 4012 × km.
 km.
So the distance is 4012 × km.
 km.