4) Four-point charges are placed on the corners of two equilateral triangles as shown in Figure 3. The charges of the particles and distance "d" is indicated are indicated below Figure 3. What is the magnitude of the electric field strength "E" at point P produced by particle #2 only? A) 0 N/C B) 9 N/C 18 N/C D) 36 N/C E) 72x10 N/C 2 = 1x 10 % ( E = 8.98 x 109 1 4 d 60⁰ 60° d d A E 60⁰ 4B Р d 60⁰ 60° d 3 Figure 3. q₁=q3=1nC, q2--2nC q4-1nC, and d=1m

3) a)What are the magnitude and direction of the force exerted on a 4.41 pC charge by a 184 N/C electric field that points due east? magnitude direction ---Select- v b) You charge a piece of aluminum foil (mass =7.46 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of 13 µC. Your professor brings a charged plate over and tells you to put the aluminum foil on top of the plate. To your surprise the aluminum foil hovers motionless in the air above it! Calculate the value of the electric field from the charged plate (assume it is a uniform field and the aluminum foil is a point charge). magnitude N/C direction -Select-- v

A positive point charge is at the origin. What happens to the strength of the electric field if you double your distance from the origin? a) the field increases by a factor of two b) field decreases by a factor of two c) field increases by a factor of four d) field decreases by a factor of four

a K 6.0 cm 15.0 cm 1 a 10.0 cm 15.0 cm b 5.0 cm 42 Two point charges q1 and q2 of -300 nC and 300 nC, respectively, are separated by a distance of 0.15 m. Calculate the electric field caused by q1, the field caused by q2, and the total field. a) at point a Eq₁ = b) at point c Eq₁ = Eq₂=_ , Eq₂=. _ET=_ _E₁=

1) Sketch the electric field lines on top of the figure above. Also sketch the electric field vector atpoint P. 2) Integrate to find the value of the electric field at point P.3) Find the force that would act on a 2.0 μC charge placed at point P.

7. In the figure below, the particles have charges qr=-q2=100 n and q =-q 200 nC, and distance a = 5.0 cm. What are the (a) x and (b) y components of the net electrostatic force on force you calculated in part (c) on the diagram and label the angle.

Two particles, each with a charge +Q, that are located at the oppositecorner of a square of side d. Given Q = 9 nC and d = 0.5 m, what is the magnitude of electric field at point P? A) 611 N/CB) 324 N/CC) 458 N/CD) 432 N/CE) 764 N/C