In: Physics
Object A, with a charge of 2 C, and object B, with a charge of -5 C, attract each other with a force of 2 N. If the distance separating them stays the same, what will be the attractive force between them when the charge on object A is reduced to 1C?
Ans : 1 N
Explanation:   Taking initial condition, qA
= 2 C, qB = -5 C, k = 
 Nm2/C2
Putting in equation of Coulomb's Law
                                                           
                                                            
                                                           
                                                          
 m    _________ (1)
Now, if qA = 1 C , then again applyng Coulomb's Law
                                                  
       
                                                         
                                                        
          (Using
eqn (1) )
                                                      
 N (Attractive)
So, the attractive force between the object A and object B will be 1 N.