Answer:
what's your question I can't understand 
 
        
             
        
        
        
Answer:
E=
Explanation:
We are given that 
Charge on ring= Q
Radius of ring=a
We have to find the magnitude of electric filed on the axis at distance a from the ring's center.
We know that the electric field at distance x from the center of ring of radius R is given by 

Substitute x=a and R=a
Then, we get 




Where K=
Hence, the magnitude of the electric filed due to charged ring on the axis of ring at distance a from the ring's center=
 
        
             
        
        
        
It's not possible to answer the question exactly the way it's written.
That's because we don't know anything about the direction they
drive at any time during the trip.  
You see, "velocity" is not just a word that you use for 'speed' when 
you want to sound smart and technical, like this question is doing.  
"Velocity" is a quantity that's made up of speed AND THE DIRECTION 
of the motion.  If you don't know the direction of the motion, then you 
CAN'T tell the velocity, only the speed.
Here are the average speeds that Lori's family drove on each leg 
of their trip:
Speed = (distance covered) / (time to cover the distance) .
Leg-A:  
Speed = 15km/10min = 1.5 km/min
Leg-B:  
Speed = 20km/15min = (1 and 1/3) km/min
Leg-C  
Speed = 24km/12min = 2 km/min
Leg-D:  
Speed = 36km/9min = 4 km/min
Leg-E: 
Speed = 14km/14min = 1 km/min
From lowest speed to highest speed, they line up like this:
[Leg-E] ==> [Leg-B] ==> [Leg-A] ==> [Leg-C] ==> [Leg-D]
  1.0 . . . . . . . . 1.3 . . . . . . . 1.5 . . . . . . . 2.0 . . . . . . . 4.0 . . . . km/minute   
Whoever drove Leg-D should have been roundly chastised 
and then abandoned by the rest of the family.  36 km in 9 minutes 
(4 km per minute) is just about 149 miles per hour !  
        
                    
             
        
        
        
Answer:
0.075A
Explanation:
We can consider this system as a circuit, hence we can take the current from the formula for the electric power as follow
 
 
I hope this is useful for you
regards
 
        
             
        
        
        
Answer:
did you get it done if not lmk I will help you out tomorrow when I get up