<h3><u>Answer;</u></h3>
Mechanical advantage 
<h3><u>Explanation;</u></h3>
- Mechanical advantage is the ratio of force output from a machine divided by the force input into the machine.
- Mechanical advantage measures the machine's force-magnifying effect. It is an advantage gained by using simple machines to accomplish work with less effort.
- The formula is; M.A = output force/ Input force
 
        
        
        
Answer:
a) The electric field at that point is  newtons per coulomb.
 newtons per coulomb.
b) The electric force is  newtons.
 newtons. 
Explanation:
a) Let suppose that electric field is uniform, then the following electric field can be applied: 
 (1)
 (1)
Where:
 - Electric field, measured in newtons per coulomb.
 - Electric field, measured in newtons per coulomb.
 - Electric force, measured in newtons.
 - Electric force, measured in newtons.
 - Electric charge, measured in coulombs.
 - Electric charge, measured in coulombs. 
If we know that  and
 and  , then the electric field at that point is:
, then the electric field at that point is:


The electric field at that point is  newtons per coulomb.
 newtons per coulomb.
b) If we know that  and
 and  , then the electric force is:
, then the electric force is:



The electric force is  newtons.
 newtons. 
 
        
             
        
        
        
Freezing.................
        
             
        
        
        
I believe the answer is the fourth one, hope this helps
        
                    
             
        
        
        
<em>Answer</em>
 0.6 teslas
<em>Explanation</em>
When a conductor is inside a magnetic field it experiences a force given by;
Force = ILBsinθ
Where I⇒ current 
 L ⇒length of the conductor
 B ⇒ magnetic field strength
 θ ⇒ Angle between the conductor and magnetic field. 
F = ILBsinθ
When θ = 90°, Then sin 90 =1 and the formula becomes;
F =ILB 
3 = 10 × 0.5 × B
3 = 5B
B = 3/5 
 = 0.6 
magnetic field strength = 0.6 teslas