Explanation:
The given data is as follows.
            F = 
           q = 
           v = 385 m/s
         = 0.876
 = 0.876
Now, we will calculate the magnitude of magnetic field as follows.
               B = 
                   = 
                   =  T
 T
                   = 10.65 T
Thus, we can conclude that magnitude of the magnetic field is 10.65 T.
 
        
             
        
        
        
Doubling the size of a load resistor increases the load current. Increasing the load resistance, in turn the total circuit resistance is reduced. The load current would not be half as much since when you increase the size of load resistor then load current increases.
        
             
        
        
        
Answer:
42KVA
Explanation:
Given data
High Voltage (HV)= 480V
Low Voltage (LV)= 277V
Fo find 
Size of transformer=?
Solution
To find the size of transformer here we use the co-ratio.The Co-ratio is given as: 
Co-Ratio= (HV - LV)/HV
where 
HV is High Voltage 
LV is Low Voltage
Now put the values we get
Co- Ratio=(480-277)/480=.42
So the size of transformer is 42KVA
 
        
             
        
        
        
Answer:
106.7 N
Explanation:
We can solve the problem by using the impulse theorem, which states that the product between the average force applied and the duration of the collision is equal to the change in momentum of the object:

where
F is the average force
 is the duration of the collision
 is the duration of the collision
m is the mass of the ball
v is the final velocity
u is the initial velocity
In this problem:
m = 0.200 kg
u = 20.0 m/s
v = -12.0 m/s

Solving for F,

And since we are interested in the magnitude only,
F = 106.7 N