Slide 1 / 71 Slide 2 / 71 1 A negative charge is placed on a conducting sphere. Which statement is true about the charge distribution Electric Potential A Concentrated at the center of the sphere Charge density increases from the center to the B surface Multiple Choice Uniformly distributed on the sphere's outer C surface. Problems D Uniformly distributed inside the sphere E More information is required Slide 3 / 71 Slide 4 / 71 2 An electric charge Q is placed at the origin. What 3 Which of the following statements about is the ratio between the absolute potential at point conductors under electrostatic conditions is true? A and point B? Positive work is required to move a positive A charge over the surface of a conductor. A 4/1 B 2/1 Charge that is placed on the surface of a B conductor always spreads evenly over the C 1 surface. D 1/2 The electric potential inside a conductor is C E 1/4 always zero. The electric field at the surface of a conductor is D tangent to the surface. The surface of a conductor is always an E equipotential surface. Slide 5 / 71 Slide 6 / 71 4 Which of the following represents the magnitude, 5 Points A and B are each the same distance r from two unequal charges, +Q and +2Q. The work of the potential V as function of r, the distance required to move a charge q from point A to point from the center of a conducting sphere charged B is: with a positive charge Q, when r > R? dependent on the A path taken from A to A 0 B B kQ/R directly proportional C kQ/r B to the distance kQ/R 2 D between A and B kQ/r 2 E C positive D zero E negative
Slide 7 / 71 Slide 8 / 71 6 An electric field is created by a positive charge. 7 An electric field is created by a positive charge. The distribution of the electric field lines and The distribution of the electric field lines and equipotential lines is presented on the diagram. equipotential lines is presented on the diagram. A Which statement about electric potential is true? test charge +q is moved from point to point in the electric field. Which statement about work done by the electric field on charge +q is true? A V A > V B > V C > V D > V E B V A < V B < V C < V D < V E A W A→B >W A→C C V A = V D > V B > V C = V E B W A→D >W A→E D V A > V B = V C > V D = V E C W D→C <W A→E E V A > V B > V C = V D = V E D W A→D =W C→E =0 E W A→B =W A→E Slide 9 / 71 Slide 10 / 71 8 Two parallel conducting plates are charged with 9 A point charge q is released from rest at point A an equal and opposite charges. Which statement and accelerates is a uniform electric field E. What is the ratio between the work done by the field on is true about the magnitude of the electric the charge: W A→B /W B→C ? potential? A Greater at point A A 1/2 B Greater at point B B 1/4 C Greater at point C C 1 D Greater at point D D 2/1 The same at points E 4/1 E B, C, D and zero at point A Slide 11 / 71 Slide 12 / 71 10 A point charge q is released from rest at point A 11 A point charge Q 1 = +4.0 µC is placed at point -2 m. and accelerates is a uniform electric field E. What A second charge Q 2 is placed at point +3 m. The net is the ratio between velocities of the charge V B /V C ? electric potential at the origin is zero. What is charge Q 2 ? Magnitude Sign A 1/(√2 ) A 9.0 µC Positive B (√2)/3 B 6.0 µC Positive C 1 D (√2)/1 C 3.0 µC Positive E (√3)/2 D 6.0 µC Negative E 9.0 µC Negative
Slide 13 / 71 Slide 14 / 71 12 A conducting sphere is charged with a positive 13 An electric field is presented by a series of charge +Q. Which of the following is the correct equipotential lines. At which location the electric relationship for the electric potential at the points field strength is the greatest? A, B, and C? A A V A < V B < V C B B V A > V B < V C C C V A < V B > V C D D V A = V B < V C E E V A = V B > V C Slide 15 / 71 Slide 16 / 71 A uniform conducting sphere of radius 15 A uniform conducting sphere of radius R is 14 R is charged with a positive charge +Q. charged with a positive charge +Q. Which of the Which of the following is correct following is correct relationship between the relationship between the potential and distance from the center of the sphere? electric field and distance from the center of the sphere? C E A A C E B D B D Slide 17 / 71 Slide 18 / 71 16 Two positive charges A and B are placed at the 17 Two charges +Q and –Q are placed at the corners corners of equilateral triangle with a side r. What of equilateral triangle with a side r. What is the net is the net electric potential at point C? electric potential at point C? A (√2)kQ/r A 0 B (√3)kQ/r B (√3)kQ/r C kQ/r C kQ/r D (√5)kQ/r D (√5)kQ/r E 2kQ/r E 2kQ/r
Slide 19 / 71 Slide 20 / 71 18 Four positive Q charges are arranged in the corner 19 Two conducting spheres of different radii are charged with the same charge - Q. What will happen to the charge if the spheres are connected with a of a square as shown on the diagram. What is the conducting wire? net electric potential at the center of the square? A 0 Negative charge flows from the large sphere to the smaller sphere until A 8kQ the electric field at the surface of each sphere is the same B (√2)r Negative charge flows from the smaller sphere to the larger sphere until B 4kQ the electric field at the surface of each sphere is the same C (√2)r Negative charge flows from the large sphere to the smaller sphere until C the electric potential at the surface of each sphere is the same 16kQ D Negative charge flows from the smaller sphere to the larger sphere the (√2)r D electric potential at the surface of each sphere is the same 2kQ E There is no charge flow between the spheres E (√2)r Slide 21 / 71 Slide 22 / 71 20 A charged particle is projected with its initial 21 A positive charge of +3 µC is moved from point A velocity perpendicular to a uniform electric field. to point B in a uniform electric field. How much The resulting path of the particle is: work is done by the electric field on the charge? A spiral A 100 µJ B parabolic arc B 120 µJ C circular arc C 140 µJ D straight line parallel to the field D 160 µJ E straight line perpendicular to the field E 180 µJ Slide 23 / 71 Slide 24 / 71 22 Two positive charges with a magnitude of Q are 23 An electron with energy of 200 eV enters a located at points (+1,0) and (-1,0). At which of the uniform electric field parallel to the plates. The following points is the electric potential the electron is deflected by the electric field. What is greatest in magnitude? the kinetic energy of the electron just before it strikes the upper plate? A (+2,0) A 50 eV B (0,-1) B 100 eV C (0,0) C 200 eV D (+3,0) D 300 eV E (0,+1) E 400 eV
Slide 25 / 71 Slide 26 / 71 24 A parallel-plate capacitor has a capacitance C 0 . 25 A parallel-plate capacitor is charged by a battery What is the capacitance of the capacitor if the area and then disconnected. What will happen to the is doubled and separation between the plates is charge on the capacitor and voltage across it if the doubled? separation between the plates is decreased and the area is increased? A 4 C 0 A Both increase B 2 C 0 B Both decrease C C 0 C Both remain the same D 1/2 C 0 The charge remains the same and voltage E 1/4 C 0 D increases The charge remains the same and voltage E decreases Slide 27 / 71 Slide 28 / 71 26 A parallel-plate capacitor is charged by 27 A parallel-plate capacitor is connected to a battery connection to a battery and remains connected. with a constant voltage. What happens to What will happen to the charge on the capacitor capacitance, charge, and voltage if a dielectric and voltage across it if the separation between the material is placed between the plates? plates is decreased and the area is increased? Capacitance Charge Voltage A Both increase Increases Increases Decreases A B Both decrease Decreases Increases Remains the same B C Both remain the same Remains the same Decreases Increases C The voltage remains the same and charge Increases Increases Remains the same D D increases Decreases Remains the same Increases E The voltage remains the same and charge E decreases Slide 29 / 71 Slide 30 / 71 28 A parallel-plate capacitor is connected to a battery 29 A parallel-plate capacitor is connected to a battery and becomes fully charged. The capacitor is then with a constant voltage. The capacitor becomes disconnected, and the separation between the fully charged and stays connected. What happens plates is increased in such a way that no charge to the energy stored in the capacitor if the leaks off. What happens to the energy stored in separation is decreased? the capacitor? A Remains the same A Remains the same B Increased B Increased C Decreased C Decreased D Zero D Zero E More information is required E More information is required
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