They discovered a vaccine to reduce illnesses, specifically Polio and Influenza. The work of Salk and Sabin has almost eradicated what was once a deadly disesase ( polio) . For example, there were 350,000 deaths related to poliovirus  across the world in 1988 and they reduced to 22 in 2017. Also, their work has saved millions of lives from polio induced paralysis
 
        
                    
             
        
        
        
Answer:
Explanation:
Since the wires attract each other , the direction of current will be same in both the wires .
 Let I be current in wire which is along x - axis 
force of attraction per unit length between the two current carrying wire is given by 
  x 
where I₁ and I₂ are currents in the wires and d is distance between the two 
Putting the given values
285 x 10⁻⁶ = 10⁻⁷ x 
I₂ = 16.76 A 
Current in the wire along x axis is 16.76 A 
To find point where magnetic field is zero due the these wires
The point will lie between the two wires  as current is in the same direction. 
Let at y = y , the neutral point lies 
k 2 x  
 = k 2 x 
25.5y = 16.76 x .3 - 16.76y 
42.26 y = 5.028
y = .119 
= .12 m