1. [-l1 Points] DETAILS OSCOLPHYSZO16 18.1.P.001. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Common static electricity involves charges ranging from nanocoulombs to microcoulombs. (a) How many electrons are needed to form a charge of 5.50 nC? electrons (b) How many electrons must be removed from a neutral object to leave a net charge of 0.650 uC? electrons Addltlonal Materials III Reading 2. [-/1 Points] DETAILS OSCOLPHYSZO16 18.2.P.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An amoeba has 1.65 x 1016 protons and a net charge of 0.630 pC. (a) How many fewer electrons are there than protons? electrons (b) If you paired them up, what fraction of the protons would have no electrons? protons without electrons protons 3. [-/1 Points] DETAILS OSCOLPHYS2016 18.2.P.008. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What net charge would you place on a 111 g piece of sulfur if you put an extra electron on 1 in 102 of its atoms? (Sulfur has an atomic mass of 32.1.) Additional Materials Reading Submit Answer 4. [-/1 Points] DETAILS OSCOLPHYS2016 18.3.P.010. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the repulsive force between two pith balls that are 6.00 cm apart and have equal charges of -25.0 nc? N + Additional Materials Reading 5. [-/1 Points] DETAILS OSCOLPHYS2016 18.3.P.012. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Two point charges exert a 4.00 N force on each other. What will the force (in N) become if the distance between them is increased by a factor of 10? N6. [-l1 Points] DETAILS OSCOLPHYSZO16 18.3.P.014. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER How far apart (in mm) must two point charges of 90.0 nC (typical of static electricity) be to have a force of 8.40 N between them? mm Additional Materials Ell Reading 7. [-I1 Points] DETAILS OSCOLPHYSZO16 18.3.P.016. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A test charge of +9 uC is placed halfway between a charge of +6 [1C and another of +2 uC separated by 19 cm. (a) What is the magnitude of the force (in N) on the test charge? N (b) What is the direction of this force (away from or toward the +6 |.IC charge)? away from the +6 |.IC charge ' toward the +6 uC charge 8. [-/1 Points] DETAILS OSCOLPHYS2016 18.4.P.027. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the magnitude (in N/C) and direction of an electric field that exerts a 1.50 x 10-3 N upward force on a -1.70 JC charge? magnitude N/C direction --Select-- O + Additional Materials Reading 9. [-/1 Points] DETAILS OSCOLPHYS2016 18.4.P.029. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Calculate the magnitude (in N/C) of the electric field 1.60 m from a point charge of 4.80 mC (such as found on the terminal of a Van de Graaff). N/C10. [-/1 Points] OSCOLPHYSZO16 18.5.WA.038. ASK YOUR TEACHER PRACTICE ANOTHER Three charged marbles are glued to a nonconducting surface and are placed in the diagram as shown. The charges of each marble are q1 = 5.80 uC, q2 = 1.50 uC, and q3 = 2.05 uC. Marble 171 is a distance r1 = 3.00 cm to the left of the marble qz, while marble q3 is a distance r3 = 2.00 cm to the right of the marble '72: as shown. Calculate the magnitude of the electric eld a distance r' = 1.00 cm to the left of the center marble. N/C Another marble is placed 1 cm to the left of the middle marble. If this new marble has a charge of 3.66 uC, calculate magnitude and direction of the force on it. magnitude N direction fuselecrfu 11. [-/1 Points] DETAILS OSCOLPHYS2016 18.5.WA.041. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Point charges of 29.0 JC and 49.0 JC are placed 0.500 m apart. (a) At what point along the line connecting them is the electric field zero? m (from the smaller charge) (b) What are the magnitude and direction of the net electric field halfway between them? magnitude N/C direction ---Select---12. [-/1 Points] DETAILS OSCOLPHYS2016 18.6.WA.058. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the following. 0.500 mm 60.0 (a) Red blood cells often become charged and can be treated as point charges. Healthy red blood cells are negatively charged, but unhealthy cells (due to the presence of a bacteria, for example) can become positively charged. In the figure, three red blood cells are oriented such that they are located on the corners of an equilateral triangle. The red blood cell charges are A = 1.50 pC, B = 6.90 pC, and C = -4.00 pC. Given these charges, what would the magnitude and direction of the electric field be at cell A? (1 pC = 1 x 10-12 C.) magnitude N/C direction . counterclockwise from the +x-axis (b) If the charge of cell A were doubled, how would the electric field at cell A change? The magnitude of the field would be doubled. The magnitude of the field would be halved. The magnitude of the field would be quadrupled. The field would be unchanged.13. [-/1 Points] DETAILS OSCOLPHYSZO16 18.7.P.041. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the force on the charge in newtons located at x = +8.00 cm in part (a) of the gure below given that q = 5.00 nC? (The positive direction is to the right.) 5 10 x (cm) +q 2q M] (b) J.l|O.ll.lOiO'+ 0 5 1 O x (cm) 2q +q M a 14. [-/1 Points] DETAILS OSCOLPHYS2016 18.7.P.042. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the following figure. (If you need to use co or -co, enter INFINITY or -INFINITY, respectively.) (a) 10 x (cm) +q -2q +q (b) 5 10 x (cm) -29 +q +3q -q (a) Find the total electric field in N/C at x = 8.00 cm in part (b) of the figure above given that q = 5.00 nc. N/C (b) Find the total electric field in N/C at x = 11.90 cm in part (b) of the figure above. (Include the sign of the value in your answer.) N/C (c) If the charges are allowed to move and eventually be brought to rest by friction, what will the final charge configuration be? (That is, will there be a single charge, double charge, etc., and what will its value(s) be? Use the following as necessary: q.)15. [-/1 Points] DETAILS OSCOLPHYS2016 18.7.P.046. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the figure below. O qa Oq O qd (a) Using the symmetry of the arrangement, determine the direction of the electric field at the center of the square in the figure, given that qa = 9 = +4.00 UC and q = 9d = -4.00 JC. ---Select--- (b) Calculate the magnitude of the electric field (in N/C) at the location of q, given that the square is 4.50 cm on a side. N/C16. [-/1 Points] DETAILS OSCOLPHYS2016 18.8.P.053. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A simple and common technique for accelerating electrons is shown in the figure below, where there is a uniform electric field between two plates. + Electrons are released, usually from a hot filament, near the negative plate, and there is a small hole in the positive plate that allows the electrons to continue moving. (a) Calculate the acceleration in meters per second squared of the electron if the field strength is 8.10 x 104 N/C. m/s2 (b) Explain why the electron will not be pulled back to the positive plate once it moves through the hole. ---Select