Answer:
The neutral wire is often confused with ground wire, but in reality, they serve two distinct purposes. Neutral wires carry currents back to power source to better control and regulate voltage. Its overall purpose is to serve as a path to return energy.
 
        
             
        
        
        
Ans:
C
Explanation:
because it is moving down the stairs 
 
        
             
        
        
        
Answer:
The hummingbird travels the total distance is 10 m
Explanation:
Given that,
A hummingbird flies forward and backward. 
According to figure,
We know that,
The total distance is equal to the sum of all distance.
Forward direction is positive and backward direction is negative.
We need to calculate  the hummingbird travels the total distance
Using figure,

Put the value into the formula


Hence, The hummingbird travels the total distance is 10 m.
 
        
             
        
        
        
The correct answer among all the other choices is 4. This is the number of the lowest energy level that contains an f sublevel. Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help. 
        
             
        
        
        
Explanation:
the missing figure in the Question has been put in the attachment.
Then from the figure we can observe that
 the center of the sphere is positive, therefore, negative charge will be  induced at A.
As B is grounded there will not be any charge on B
Hence the answer is A is negative and B is charge less.