The Answer that makes the most sense is C.
        
                    
             
        
        
        
Explanation:
Formula for angle subtended at the center of the circular arc is as follows.
            
where,   S = length of the rod
               r = radius
Putting the given values into the above formula as follows.      
                 
                              = 
                              = 
                              = 
Now, we will calculate the charge density as follows.
                  
                             = 
                             = 
Now, at the center of arc we will calculate the electric field as follows.
                  E = 
                      = 
                       = 34.08 N/C
Thus, we can conclude that the magnitude of the electric eld at the center of curvature of the arc is 34.08 N/C.
 
        
             
        
        
        
Answer:
Here are some examples of tropism in plants : Sunflowers are one of the best examples of positive phototropism , as they always grow facing the sun. 
Explanation:
 Although some experts consider that perhaps such a clear growth movement should not be considered tropism.
 
        
             
        
        
        
Sound waves travel faster through <em>solids</em> than they do through gases or liquids.  <em>(C)  </em>They don't travel through vacuum at all.
Example:
Speed of sound in normal air . . . around 340 m/s
Speed of sound in water . . . around 1,480 m/s
Speed of sound in iron . . . around 5,120 m/s