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p117b_07_prim_ans - Physics 117 B Sec 1(Prof Csorna 9:00 AM...

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Physics 117 B Sec 1 (Prof. Csorna) 4/28/07 9:00 AM Primary Final Formulas and Constants:
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J : P > w • “ * $ x • “ * U v • “ * U v • “ * U v • “ * ¡ Æ u @ k oe E 7 @ A pair of charges conducting plates produces a uniform field of 12,000 N/c, directed to the right, between the plates. The separation of the plates is 40 mm. 1) In the figure above, an electron is projected from plate A, directly towards plate B, with an initial velocity of v 0 = 2.0 x 10 7 m/s. The velocity of the electron as it strikes plate B is closest to: A) 1.2 x 10 7 m/s B) 1.5 x 10 7 m/s C) 1.8 x 10 7 m/s D) 2.1 x 10 7 m/s E) 2.4 x 10 7 m/s ans B Figure 22.3 2) Two hollow conducting spheres have a common center O. The dimensions of the spheres are as shown. A charge of - h nC is placed on the inner conductor and a charge of + h nC is placed on the outer conductor. The inner and outer surfaces of the spheres are respectively denoted by A, B, C, and D, as shown. In the figure above, , the charges on surfaces A and B respectively, in nC, are closest to: A) 0 and - h B) 0 and - h C) 0 and - h D) - h and - h E) - h and - h ans A 3) In a given region the electric field is constant and has the value 100 V/m. It points in the positive x- direction. If the potential at the point x = 4 cm on the x-axis is 6 volts, what would be the potential at the point x = 16 cm? A) -22 V B) -18 V C) -10 V D) -6 V E) +6 V ans D
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4) Each plate of a parallel-plate air capacitor has an area of w m 2 , and the separation of the plates is mm. An electric field of h x 10 6 V/m is present between the plates. The energy density between the plates is closest to: ans A 5) In the figure above, the four identical capacitors in the circuit shown here are initially uncharged. The switch is thrown first to position A and then to position B. After this is done
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