PHY222_hw_4_ch24 - Physics 222 Homework #4 on Chapter 24 of...

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Unformatted text preview: Physics 222 Homework #4 on Chapter 24 of text Choose the best answer from each question. 1. The figure above shows two point charges, Q1 = +60 nC (at origin) and Q2 = -90 nC (0.8m to the right of Q1 ). An electron is released from rest at point C. The speed (in m/s) of the electron as it arrives at infinity is closest to A) 1.7x107 B) 1.5x107 Use the following to answer questions 2-4. C) 1.3x107 D) 1.9x107 E) 1.1x107 Figure 1: A charge Q = -800 nC is uniformly distributed on a ring of 2.4 m radius. A charge q = +600 nC is placed at 2. 3. the center of the ring. Points A and B are located on the axis of the ring, as shown. The work done by an external force that transports an electron from B to A is closest to: A) -500 eV B) -700 eV C) +500 eV D) -300 eV E) +700 eV The electric potential is equal to zero at a point on the axis of the ring. The distance of this point from the center of the ring is closest to: A) 2.8 m B) 2.4 m C) 2.6 m D) 2.7 m E) 2.5 m 4. An electron is projected along the axis of the ring from infinity. The electron reaches and comes to a momentary halt at a point on the axis which is 5.0 m from the center of the ring. The initial speed of the electron at infinity is closest to: A) 2x106 m/s B) 9x106 m/s C) 3x106 m/s D) 4x106 m/s E) 6x106 m/s 5. In the figure above, four charges are placed at the corners of a square of side 3 cm. What is the electrostatic energy of this system? A) -5.60 J B) -4.80 J C) -6.20 J D) -2.40 J E) -3.10 J Use the following to answer question 6. Figure 2: Two large conducting parallel plates A and B are separated by 2.4 m. A uniform field of 1500 V/m, in the positive x-direction, is produced by charges on the plates. The center plane at x = 0.0 m is an equipotential surface on which V = 0. An electron is projected from x= 0.0 m, with an initial kinetic energy K = 300 eV, in the positive x-direction, as shown. In Figure 2, the kinetic energy of the electron as it reaches a plate is closest to: 6. A) 1800 eV B) 3600 eV C) 2100 eV D) 300 eV E) 1500 eV 7. Two conducting spherical shells are concentric, with radii of 0.80 m and 2.00 m. The electric potential of the inner shell, with the respect to the outer shell, is +1080 V. The maximum electric field magnitude between the shells is closest to: A) 2800 V/m B) 2400 V/m Use the following to answer questions 8-9. C) 2200 V/m D) 2600 V/m E) 2000 V/m 8. Two long conducting cylindrical shells are coaxial and have radii of 20 mm and 80 mm. The electric potential of the inner conductor, with respect to the outer conductor, is +600 V. An electron is released from rest at the surface of the outer conductor. The speed of the electron as it reaches the inner conductor is closest to: A) 1.1 x 107 m/s B) 1.7 x 107 m/s C) 1.3 x 107 m/s D) 1.5 x 107 m/s E) 1.9 x 107 m/s E) 14,000 V/m 9. The maximum electric field magnitude between the cylinders is closest to: A) 26,000 V/m B) 22,000 V/m C) 10,000 V/m D) 18,000 V/m 10. Figure 3: Three conducting spheres of radii 1 meter, 2 meters and 3 meters are shown. The spheres are positioned with each center on the corner of an equilateral triangle having a side of 50m. A charge of 4 x 10-4 coulombs is initially placed on the large sphere while it is isolated from other two spheres. The spheres are then interconnected by very thin neutral conducting wires. Assume that all of the charge ends up on the three spheres and none ends up on the wires. After the system reaches a state of electrostatic equilibrium, which of the following is closest to the the charge on the large sphere? A) 2.57 x 10-4 C B) 2.00 x 10-4 C C) zero D) 0.67 x 10-4 C E) 1.33 x 10-4 C ...
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This note was uploaded on 05/10/2009 for the course PHYS PHYSIC 222 taught by Professor O'neil during the Spring '09 term at Fullerton College.

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