p117b_07_t1_ans

# p117b_07_t1_ans - Physics 117 B Sec 1 (Prof. Csorna) 2/1/07...

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Physics 117 B Sec 1 (Prof. Csorna) 2/1/07 TEST #1 Formulas and Constants:

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1. An electron is projected with an initial velocity V 0 =3.0 x 10 7 m/s along the y-axis, which is the center line between a pair of charged plates. The plates are 1.00 m long and are separated by 0.10 m. A uniform electric field E, in the positive x-direction, is present between the plates. The magnitude of the acceleration of the electron is h x 10 15 m/ s 2 The magnitude of the electric field between the plates is closest to: A) 8 3 N/C B) 8 3 N/C C) 8 3 N/C D) 8 3 N/C E) 8 3 N/C Ans: A 2. Four charges of equal magnitudes but opposite signs are arranged at the corners of a square, as shown here. In which arrangement is the magnitude of the electric field at point P a maximum? A) B) C) D) E) The maximum electric field occurs in more than one of these arrangements. Ans: B
3. In the figure below, three hollow, concentric spherical conductors are charged as follows: inner sphere carries charge Q, middle sphere carries charge -2Q, outer sphere carries charge -Q . What is the charge on the outer surface of the middle sphere? A) zero B) -Q C) +Q D) +2Q E) -2Q Ans:B 4. A conductor is distinguished from an insulator with the same number of atoms by the number of: A) nearly free atoms D) protons B) electrons E) molecules C) nearly free electrons Ans: C 5. A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball,

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p117b_07_t1_ans - Physics 117 B Sec 1 (Prof. Csorna) 2/1/07...

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