Can you help me pleases with these questions. I DO NOT UNDERSTAND ANY OF THESE QUESTIONS #1-26.

The questions are shown in the screenshots down below.

Indicate the answer choice that best completes the statement or answers the question. 1. The charge per unit length on an insulator is 6.2 pC/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons? a. There are 7.8 * 10" more electrons than protons. b. There are 7.8 x 10'* more protons than electrons. 5 13 . There are 3.9 x 10"~ more protons than electrons. 13 d. There are 3.9 x 10" more electrons than protons. 2. Object A has a charge on it, object B has a charge on it, and object C has a charge 3 on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it? a. A b. B c.C d. All have equal magnitude forces on them. e. Aand B 3. Two electrons are separated by 7.0 cm. What is the ratio of the electric force to the gravitational force between them? (m,=9.11 x 10 kg, k, = 8.99 x 10 N-m*/C*, G=6.67x 10 "' N-m?/kg, and e = 1.6 x 10 " C) a. 2.3E+2 b. 1.3E+2 0 c. 3.1E+2 2 d. 42E+4 2 e. 1 4. The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 3.2 x 107 m/s in a distance of 2.00 cm. What electric field is required? (m, = 9.11 x 107! kg and e = 1.60 x i C) a. 4.6E+4 N/C b. 2.3E+5 N/C c. 1.5E+5 N/C d. 2.9E+5 N/C e. 1.6E+4 N/C 5. Charges of 3.5 uC and -7.6 uC are placed at two corners of an equilateral triangle with sides of 0.1 m. At the third corner, what is the electric field magnitude created by these two charges? (k. = 8.99 x 10\" N-m*/C?) a. L.2E+7 N/ C b. 3.0E+6 N/C c. 5.5E+6 N/ C d. 5.9E+6 N/C e. 7.9E+6 N/ C 6. The electric field associated with a uniformly charged hollow metallic sphere is the greatest at: a. the center of the sphere. b. the sphere's inner surface. c. infinity. d. the sphere's outer surface. n 7. A proton (+1.6 x 10 C) moves 20 cm on a path in the direction of a uniform electric field of strength 2.4 N/C. How much work is done on the proton by the electrical field? a. 7.7E-20 J b. -7.7E-20 c. 1.8E-19 J d. -8.6E-20 e. zero 8. A uniform electric field, with a magnitude of 650 N/C, is directed parallel to the positive x-axis. If the potential at x = 3.0 m is 1 700 V, what is the potential at x = 1.0 m? a. 3 300 V b. 4 050 V c. 3 000 V d. 400 V e. 1 500 V 9. A 10.00-V battery is connected between two parallel metal plates 4.00 mm apart. What is the magnitude of the electric field between the plates? a. 2.50 x 103 N/C b. 25.0 N/C c. 14.0 N/C d. 4.00 x 10 N/C e. 2.90 x 10' N/C10. Two point charges of values +2.0 and +5.5 uC, respectively, are separated by 0.50 m. What is the potential energy of this 2-charge system? (k, = 8.99 x 10 N -1112/('?2) a. +0.50 J b. -0.20 c. +0.20 d. -0.41 e. +0.41 11. A point charge of +4.0 uC is located at the origin of a coordinate system and a second point charge of =6.6 uC is at x = 1.7 m. What is the electric potential at the x = 0.85 m point? (k, = 8.99 x 10' N- 1112/(.',2) a29x 10* v b 275 10T C. 56 x 10V d._27x10* v e. 56 % 10V 12. If the plane x = 4 m is an equipotential surface, in which of the following directions can the electric field be in the region immediately adjacent to this plane? a. the positive y direction b. both the positive and negative z directions c. the positive x direction d. more than one of these choices 13. A parallel-plate capacitor has a capacitance of 25 uF. What potential difference across the plates is required to store 7.2 x 10 * C on this capacitor? a. 2.9E+1 V b. 3.6E+1 c. 4.5E+9 V d. 2.9E-1 V e. 4.5E+5 V 14. If C= 36 uf, determine the equivalent capacitance for the combination shown. 20 20 a. 36 UF b. 28 UF c. 14 UF d. 24 UF e. 33 u F15. A 3.5-uF capacitor is attached to a 20-V power supply. How much energy is stored in the capacitor? a. 7.0E-4 b. 7.0E-3 c. 2.5E-4 d. 2.4E-3 e. 2.0E-3 16. The current in an electron beam in a cathode-ray tube is measured to be 50 MA. How many electrons hit the screen in 7.0 s? (e = 1.6 x 10 ' C) a. 4.4 x 10 electrons b. 3.5 x 10 electrons c. 2.2 x 10" electrons d. 3.1 x 10 8 electrons e. 2.7 x 10 electrons 17. How long is a wire made from 100 cm' of copper if its resistance is 4.0 ohms? The resistivity of copper is 1.7 x 10-5 0.m. a. 4.9 m b. 1.7 x 10' m c. 2.6 x 10' m d. 1.5 x 10' m e. 24 m18. Number 10 copper wire (radius = 1.5 mm) is commonly used for electrical installations in homes. What is the voltage drop in 20 m of #10 copper wire if it carries a current of 12 A? (The resistivity of copper is 1.7 x 1ige Q-m.) a. 0.58V b. 048V c.2.7V d.24V e. 0.34V 19. If a 600-W heater carries a current of 4.0 A, what is the voltage across the ends of the heating element? a.2400V b. 150V c. 300V d. 0.0067 V e. 49V 20. An electric car is designed to run off a bank of 15-V batteries with total energy storage of 2.1 x 10" J. If the electric motor draws 4 200 W in moving the car at a steady speed of 14 m/s, how far will the car go before it is \"out of juice?\" a. 35 km b. 70 km c. 140 km d. 110 km e. 18 km 21. The two ends of a 6.60-0) resistor are connected to a 14.2-V battery. What is the total power delivered by the battery to the circuit? a. 0.326 W b.30.6 W c.2.15W d. 619 W 22. Three resistors connected in series each carry currents labeled /1, 12 and 13. Which of the following expresses the value of the total current ly in the system made up of the three resistors in series? a. IT= h+12+ 13 b. IT = (1/1, + 1/ 12 + 1/13) c. IT= 1 = 12= 13 d. IT = (1/1 + 1/12 + 1/13) 1 23. Which resistor is in series with resistor R? R Ri MAN R2 2 R3 a. R b. R 2 C. R 3 d. R 4 24. Resistors of values 10 02, 14 0, and 23 0 are connected in series across a battery with a small internal resistance. Which resistor dissipates the greatest power? a. the 10-2 resistor b. the 14-0 resistor c. the 23-2 resistor d. The answer depends on the internal resistance of the battery.25. Two resistors of values 7.0 and 15.0 Q are connected in parallel. This combination in turn is hooked in series with a 3.8-0) resistor and a 22.3-V battery. What is the current in the 3.8-0Q resistor? a. 21 A b.2.6 A c. 0.86 A d.59A e. 190 A 26. How much power is being dissipated by one of the 10-Q resistors? 12V 20 Q @ [ah a. 24 W b. 9.6 c. 16 W d. 6.4