F09 - Exam 1(1)

F09 - Exam 1(1) - 1. Pulling the plates of an isolated...

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1. Pulling the plates of an isolated charged capacitor apart: A) increases the potential difference B) does not affect the potential difference C) decreases the potential difference D) increases the capacitance E) does not affect the capacitance 2. A small object has charge Q. Charge q is removed from it and placed on a second small object. The two objects are placed 1 m apart. For the force that each object exerts on the other to be a maximum. q should be: A) Q /4 B) Q /2 C) 2 Q D) Q E) 0 3. Consider Gauss's law: 0 /. EdA q ε =  Which of the following statements about the terms in this formula is true? A) On the surface E is everywhere parallel to dA B) If a charge is placed outside the surface, then it cannot affect E on the at any point on the surface C) If q = 0 then 0 E = everywhere on the Gaussian surface D) If the three particles inside have charges of + q , + q and 2 q , then the integral is zero E) E must be the electric field due to the enclosed charge 4. A hollow metal sphere is charged to a potential V . The potential at its center is: A) 0 B) – V C) 2 V D) π V E) V 5. A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because: A) the ball becomes positively charged by induction B) the number of electrons in the ball is more than the number in the rod C) the string is not a perfect insulator D) there is a rearrangement of the electrons in the ball E) the ball becomes negatively charged by induction Version 1 Page 1
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6. The diagram shows six 6- μ F capacitors. The capacitance between points a and b is: A) 9 F B) 3 F C) 1 F D) 6 F E) 4 F 7. Two large parallel conducting plates are separated by a distance d , placed in a vacuum, and connected to a source of potential difference V . An oxygen ion, with charge 2 e , starts from rest on the surface of one plate and accelerates to the other. If e denotes the magnitude of the electron charge, the final kinetic energy of this ion is: A)
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This note was uploaded on 09/05/2011 for the course PHYS 116b taught by Professor Haglund during the Spring '07 term at Vanderbilt.

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F09 - Exam 1(1) - 1. Pulling the plates of an isolated...

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