Adobe Reader Touch - X 1. Select the most correct answer of the following: (1.1) (1.2) (5 points) 1- The electron-volt (eV) is a unit of a) Charge. b) Electric potential. c) Electric field. d) Energy. 2- If two objects are electrically attracted to each other, then a) Both objects must be negatively charged. b) Both objects must be positively charged. c) One object must be negatively charged, and the other object must be positively charged. d) The objects could be electrically neutral. 3- How many electrons are necessary to produce 1.0 C of negative charge? (e = 1.60 x 10-19 C) a) 6.3 x 101$ b) 6.3 x 109 c) 1.6 x 1019 d) 1.6 x 109 4- As a proton moves in a direction perpendicular to the electric field lines, then a) It is moving from low potential to high potential and gaining electric potential energy. b) It is moving from low potential to high potential and losing electric potential energy. c) It is moving from high potential to low potential and gaining electric potential energy. d) Both its electric potential and electric potential energy remain constant 5- Two stationary point charges q, and 42 are shown in the figure along with a sketch of some field lines representing the electric field produced by them. What can you deduce from the sketch? a) q1 is negative and 42 is positive; the magnitudes are equal. b) q1 and 42 have the same sign; the magnitudes are equal c) q1 is positive and 42 is negative; the magnitude of a is greater than the magnitude of 42. d) 1 is negative and 42 is positive; the magnitude of an is less than the magnitude of q2- 6- A region of space contains a uniform electric field, directed toward the right, as shown in the figure. Which statement about this situation is .C correct? a) The potential at all three locations is the same. ) The potentials at points A and B are equal, and the potential at point C is higher than the potential at 2 75 point A. c) The potential at points A and B are equal, and the potential at point C is lower than the potential at - point A. d) The potential at point A is the highest, the potential at point B is the second highest, and the potential at point C is the lowest. Page 2 of 5 Dr. Radi Al Enaizi P ' 9:" ENG () $ 23.C .es, WhoiAdobe Reader Touch - X C) q1 is positive and q2 is negative, the magnitude of a, is greater than the magnitude of q2. d) q1 is negative and 42 is positive; the magnitude of a is less than the magnitude of 42- 6- A region of space contains a uniform electric field, directed toward the right, as shown in the figure. Which statement about this situation is correct? a) The potential at all three locations is the same. b) The potentials at points A and B are equal, and the potential at point C is higher than the potential at point A c) The potential at points A and B are equal, and the potential at point C is lower than the potential at point A. d) The potential at point A is the highest, the potential at point B is the second highest, and the potential at point C is the lowest. Page 2 of 5 Dr. Radi Al Enaizi 7- Two ideal parallel-plate capacitors are identical in every respect except that one has twice the plate area of the other. If the smaller capacitor has capacitance C, the larger one has capacitance a) C/2 b) C. c) 2C. d) 4C. 8- Two points charges, Q and Q2, are separated by a distance R. If the magnitudes of both charges are doubled and their separation is also doubled, what happens to the electrical force that each charge exerts on the other one? a) It increases by a factor of 2. ) It increases by a factor of V2 c) It increases by a factor of 4. d) It remains the same. 9- The electric field at point P due to a point charge Q a distance Raway from Phas magnitude E. In order to double the magnitude of the field at P, you could a) Double the distance to 2R b) Double the charge to 2Q. c) Reduce the distance to R/2. d) Reduce the distance to R/4. 10- When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced? a) 0.4 b) 1/4 2 d) A P . 9:.E ENG () ~ 23.C .es, boi