Question: Three charges are placed as shown in Fig. P21.95 . The magnitude of q 1 is 2.00 ÂµC, but its sign and the value of the charge q 2 are not known. Charge q 3 is +4.00 ÂµC, and the net force on q 3 is entirely in the negative x-direction. (a) Considering the different possible signs of q 1 , there are four possible force diagrams representing the forces that q 1 and q 2 exert on q 3 . Sketch these four possible force configurations. (b) Using the sketches from part (a) and the direction of deduce the signs of the charges q 1 and q 2 . (c) Calculate the magnitude of q 2 . (d) Determine F, the magnitude of the net force on q 3 . Answer : The electrostatic force between two charges and separated by a distance r is given by following expression. Here, is the unit vector along the direction of electric force, and k is the Coulombâ€™s constant.
The electrostatic force between like charges is repulsive and between unlike charges is attractive.
- Spring '17
- John DOe
- Electric charge