The direction of an electric field is determined from the behavior of a positive test charge that is set free in the electric field.This charge moves along a distinct vector showing the direction of the electric field  Therefore the answer is b. a positive charge will move in the field.
 
        
             
        
        
        
You will need rocks brick and water.
        
             
        
        
        
Explanation:
- effect of density in speed of sound.
- effect of direction of wind in speed of sound.
because there is no medium to travel sound in vacuum. 
hope it helps.
 
        
             
        
        
        
Answer:
3/4 of 12 = 16
3/4 of 24 = 32 
Those are the answers based on how your question sounded 
Explanation:
 
        
                    
             
        
        
        
Answer:
for -12db 
 
for 3db
 
for 10db
 
for 0db
 
Explanation:
The decibel is a logaritmic value given by:

we use 10 for power values and 20 for other values such voltages or currents.

for -12db

for 3db

for 10db

for 0db
