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Physics 2424 Midterm #1 Spring 2011 Version A Multiple choice (6 points each) 1) Sphere A carries a net positive charge and sphere B is neutral. They are placed near each other (but not touching) on an

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Physics 2424 Midterm #1 Spring 2011 Version A Multiple choice (6 points each) 1) Sphere A carries a net positive charge and sphere B is neutral. They are placed near each other (but not touching) on an insulated table. Sphere B is briefly touched with a wire that is grounded. Which statement is correct? A) Sphere B remains neutral B) Sphere B is now positively charged C) Sphere B is now negatively charged D) The charge on sphere B cannot be determined without additional information 2) A small charged ball is accelerated from rest to a speed s by a 500 V potential difference. If the potential difference is changed to 2000V, what will the new speed of the ball be? A) s B) 2s C) 4s D) 16 s E) s/4 3) In the figure shown below, where could the electric field = 0 based on the following information: (magnitude of Q2 magnitude of Q1) and (Q2 and Q1 repel each other) Q1 Q2 A B C D E 4) A parallel-plate capacitor is constructed with a plate area of 0.40 m 2 and a plate separation of 0.10 mm. How much energy is stored when it is charged to a potential difference of 12V? A) 2.5 J B) 5.0 J C) 7.5 J D) 10 J E) 1.2 J 5) Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them? A) There is no force between them since one is neutral B) There is a force of repulsion between them C) There is a force of attraction between them D) The force is attractive if A is charged positively and repulsive if A is charged negatively. E) The force is repulsive is A is charge negatively and attractive if A is charged positively. 6) How much energy is necessary to place three charges, each of 2.0 C, at the corners of an equilateral triangle of side 2.0 cm? A) 4.5 J B) 5.4 J C) 6.7 J D) 7.6 J E) 8.1 J 7) A point charge of is placed at the centroid of an equilateral triangle. When a second charge of is placed at one of the triangle s vertices, an electrostatic force of 4.0N acts on it. What is the magnitude of the force that acts on the center charge due to a third charge of placed at one of the other vertices? A) 0 B) 16 N C) 8.0 N D) 6.0 N E) 4.0 N 8) A battery charges a parallel-plate capacitor fully and then is removed. The plates are immediately pulled apart. What happens to the potential difference between the plates as they are being separated? A) It increases B) It decreases C) It remains constant D) Cannot be determined 9) Two 0.20-g metal spheres are hung from a common point by nonconducting threads which are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart until the angle between the threads is 20 degrees. How much charge was placed on each sphere? A) 10 nc B) 15 nc C) 25 nc D) 5 nc E) 20 nc 10) A foam ball of mass 0.150g carries a charge of nc. The ball is placed inside a uniform electric field, and is suspended against the force of gravity. What are the magnitude and direction of the electric field? A) 573 kn/c down B) 656 kn/c up C) 345 kn/c down D) 735 kn/c down E) 845 kn/c up 11) How much work is required to move a charge of q=+1 C from 1.0 m away to 0.25 m away from a charge Q=+2 C A).072 J B).054 J C) J D).032 J E).112 J 12) What is the magnitude of the electric field at P, the center of the square. The length of the diagonal is 2a? A) kq/a 2 B) 2kQ/a 2 C) 4kQ/a 2 D) kq/4a 2 E) 0 PP P 13) Which statement is not correct based on the figure below which shows the electric field lines from various charges. A) A is positive, B is negative and they have the same magnitude B) C is positive, D is negative and magnitude of C is larger than D C) E is negative, F is positive and magnitude of F larger than E D) G,H,I positive and magnitude of G equals magnitude of I E) G,H,I positive and magnitude of G larger than magnitude of I 14) An electron traveling horizontally enters a region where a uniform electric field is directed upward. What is the direction of the force exerted on the electron once it has entered the field? A) Upward B) To the left C) To the right D) Downward E) Out of the page toward the reader 15) Two positive point charges are separated by a distance R. If the distance between them is increased to 2R, what happens to the total electric potential of the system? A) It is doubled B) It remains the same C) It increases by a factor of 4 D) It is reduced by one-half of its original value E) It is reduced by one-fourth of its original value 16) A negative charge is moved from point A to point B along an equipotential surface. A) The negative charge performs work in moving from point A to point B B) Work is required to move the negative charge from point A to point B C) Work is required and performed in moving the negative charge from point A to point B D) No work is required to move the negative charge from point A to point B

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