3. Two same sign charges are separated by a distance r and have a force F on each other. F a. If r is doubled then F is b. If qi is doubled then F is c. If q₁ and q2 are doubled and r is halved then F is

1. Two conducting spheres are separated by 0.550 m, measured from center-to- center. The radii of the spheres are equal and much less than the separation distance. There is an attractive force between the spheres of 0.105 N. A thin wire is then connected between the two spheres until electrostatic equilibrium is achieved. The wire is then disconnected and the spheres now repel each other with a force of 0.040 N. Determine the charges that were on the spheres before they were connected together.

1. Three charges form an equilateral triangle of side length d. The top charge is 93Q and is located on the y-axis, while the bottom two are q₁ = 92 = 4Q and are located on the x-axis. What is the net force acting on q3? -4kQ2 d² (2) -4kQ2 j -AkQ² (3) (4) -8kQ² +√√3kQ² (5) d2 d² 3d² d²

1. Two positive point charges (q1, and q2) are separated at a distance of 40nm as shown in the table. For what values of the charges, coulomb force between them is maximum. No. q1 q2 1 Q/2 Q/2 2 30/4 5Q/4 3 50/6 Q/6 4 20/6 30/6 Answer : (1 mark) 2. Three charges are arranged as shown in Figure. Find the magnitude and direction of the electrostatic force on the charge at the origin. [ Given Data Coulomb's constant, K. = 8.99X10° Nm?/c] q2 6.00nC 3.00nC 0.250m 91 0.150m -2.00nC q3 1. The electrostatic force F12 calculated (between q2 and q1)from the above diagram is = 2. The electrostatic force F23 calculated (between q2 and q3)from the above diagram is = 3. The Magnitude of the resultant force on q2 measured from the above diagram is = 4. The resultant direction e measured from the -x axis is = degrees

2. A positively charged body attracts object A and repels object B. What conclusions can be drawn about the charge present on each object from these observations?

2. Three point charges are arranged as in a Figure 2. Determine the electri field at point P due to other charges. 4 3cm 2 cm 4 cm Q3 = +8 μC Q₁ =+ 3 μC Q₂ = -5 μC Figure 2

1.  Common static electricity involves charges ranging from nanocoulombs to microcoulombs. (a) How many electrons are needed to form a charge of −9.10 nC? electrons (b) How many electrons must be removed from a neutral object to leave a net charge of 0.520 µC? electrons   2. What net charge would you place on a 412 g piece of sulfur if you put an extra electron on 1 in 1012 of its atoms? (Sulfur has an atomic mass of 32.1.)   4. What is the repulsive force between two pith balls that are 10.0 cm apart and have equal charges of −39.0 nC?-------N   6.How far apart (in mm) must two point charges of 65.0 nC (typical of static electricity) be to have a force of 5.50 N between them?     7. a.What is the direction of this force (away from or toward the +6 µC charge)? away from the +6 µC chargetoward the +6 µC charge ---------mm A test charge of +9 µC is placed halfway between a charge of +6 µC and another of +7 µC separated by 17 cm. (b) What is the magnitude of the force (in N)…

15. Two charges of equal magnitude but opposite signs, Q and - Q, are placed as shown in the figure. Where does the net electric field point to the right? A. at points E and F only B. at points C and D only C. at points A and B only D. at points A, B, E and F only E. at point C only AB+ с D O E F

20. Two charges of opposite sign and equal magnitude Q are held a distance 2a apart as shown in the figure. Determine the magnitude of the electric field at the point P. +0

2. A charge of 1.5 fC and a charge of -1.5 fC are separated by a distance of 4.0 nm. (a) Calculate the magnitude of the dipole moment. (b) What direction does the dipole point in?