Four point charges of varying magnitude and sign are arranged on the corners of

Question

Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in Figure 19-6. Which of the arrows shown represents the net force acting on the point charge with a charge +Q?             

                            
           A                             
           B                             
           C                             
           D                             
           none of the above Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in Figure 19-6. Which of the arrows shown represents the net force acting on the point charge with a charge +Q?

Explanation / Answer

The two +2Q charges will point straight out from the square ( imagine that B and D are now pointing in the opposite directions, ex. B is pointing straight up and D is pointing straight to the left. ) They are pointing this way because positive charges always point out away from themselves. The +Q and -Q charges point at each other and since they have the same charge they end up cancelling each other out. What you are left with are the B and D components. Since they both have the same charge you take the direction to be inbetween the two. Hence the answer should be A, Make sense?

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