Electric Fields 13. Calculate the distance from an electron where the magnitude of the electric field would be 5.14 x 1011 MC? [5.29 x 10'11 m] 14. A proton is placed in an electric field produced by another larger charge. Ifthe magnitude of the field at this position is 1.00 x 103 N/C, calculate the magnitude of the electrostatic force on the proton. [1.6 x 10'16 N] 15. An electron and a proton are 5.29 x 10'11 m apart in a hydrogen atom. Determine the net electric field at a point midway between the two charges. [4.11 x 1012 N/C] [towards the electron] CBe-Learn Physics 30 Module 3 Assignment September 2020 16. A charge of 5.00 C is separated from another charge of -2.00 C by a distance of 1.20 m. Calculate a) The net electric field midway between the two charges [7.49 x 1010 N/C [toward the -5.00 C charge]] b) The position where the net electric field is zero. [0.735 m from the -5.00 C charge] 17. Find the net electric field intensity at point C in the diagram below. [1.2 x 10' N/C [90.09]] 4 0.040 m +20 uC +2.0 /C A 0.060 m B 18. If an alpha particle experiences an electric force of 0.250 N at a point in space, what electric force would a proton experience at the same point? [0.125 N] 19. What is the initial acceleration on an alpha particle when it is placed at a point in space where the electric field strength is 7.60 x 104 N/C? [3.66 x 1012 m/s2] 20. The electric field at a position 2.00 cm from a charge if 40.0 N/C directed away from the charge. Determine the charge producing the electric field. [+1.78 x 10-12 c] 21. What is the magnitude and direction of the electric field at point Z in the diagram below? (5.8 x 105 N/C right) q = 2.0 x 10 5 C 2 = 8.0 x 10 & C O 60 cm 30 cm - X Z22. Electric Determine the magnitude and direction of the electric field at location A in the diagrams below. 4 yC _ | cm Potential Difference CBeLearn Physics 30 Module 3 Assignment September 2020 23. 24. 25. 26. What is the speed of an electron that has 13.3 eV of kinetic energy? (answer: 2.16x106 m/s) An alpha particle traveling 7.15x104 m/s is accelerated (speeds up) through a potential difference with a magnitude of 15.3 V. What is the final speed ofthe alpha particle? (8.11x104 m/s) A proton is accelerated by a potential difference of 7.20 x 102 V. What is the change in kinetic energy of the proton? [1.15 x 10'16 J] An alpha particle gains 1.50 x 1015] of kinetic energy. Through what potential difference was it accelerated? [4.69 x 103 V] 27. 28. 29. 30. 31. 32. The electric field strength between two parallel plates is 9.3 x 102 V/m when the plates are 7.0 cm apart. What would the electric field strength he ifthe plates were 5.0 cm apart? [1.3 x 103 V/m] An electron is released from rest adjacent to the negative plate in a parallel plate apparatus. A potential difference of 500 V is maintained between the plates, and they are in a vacuum. With what speed does the electron collide with the positive plate? (1.3 x 107 m/s) An electron with a velocity of 5.0 x 105 m/s is injected into a parallel plate apparatus through a hole in the positive plate. It moves across the vacuum between the plates, colliding with the negative plate at 1.0 x 106 m/s. What is the potential difference between the plates? (68 V) lmlml pmh Uf.' :: _ hcnm nl clcctruns I _ I) (Hi) 1n hi] i) \\' l f Assuming that electrons enter the following parallel plate with a horizontal velocity of 3.20 x 106 m/ 5, how far will the electrons travel horizontally before they crash into the positive plate? [5.58 x 10'2 m] A proton is placed in an electric field between two parallel plates. If the plates are 6.0 cm apart and have a potential difference between them of 7.5 x 101 V, how much work is done against the electric field when the proton is moved 3.0 cm parallel to the plates? [0] In the previous question, how much work would be done against the electric field if the proton was moved 3.0 cm perpendicular to the plates? [6.0 x 1018 J]