Four point charges of varying magnitude and sign are arranged on the corners of
ID: 2277980 • Letter: F
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?