test1_ans(2)

test1_ans(2) - Exam Name_

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Exam
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Name___________________________________   MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  Figure 21.3 A point charge  Q   =   - 12 μC, and two other charges,  q 1  and  q 2 , are placed as shown. The electric force components on charge  Q  are   and      1) 
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In Fig.  21.3,  charge  q 1 in nC, is  closest to: 
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1) 
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_______  A) 
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+200 
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B) 
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+ 400 
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C) 
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+ 600 
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D) 
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- 400 
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E)  - 2 ans:  Figur e 21.4  
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A dipole  consists  of charges  ±5.00 µC  separated  by 1.20  mm. It is  placed in  a vertical  electric  field of  magnitud e 525 N/C  oriented  as shown  in Fig.  21.4. The  magnitud e of the  net torque  this field  exerts on  the dipole  is closest  to: 
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2)  ____ ___  2 . 4 1   × 1. 21  ×    N   m 
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2.02  ×    N  D) 
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1.01  ×    N  E) 
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3.15  ×    N  ans: C  3) 
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Two  uncharged  metal  spheres,  #1 and #2,  are  mounted  on  insulating  support  rods. A  third  metal  sphere,  carrying a  positive  charge, is  then  placed  near #2.  Now a  copper  wire is  momentar ily  connected  between  #1 and #2  and then  removed.  Finally,  sphere #3  is  removed.  In this  final state 
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3)  ____ ___  s p h e r e   # 1   c a r r i e s   n e ga tiv ch ar ge  an #2  ca rri es  po sit iv ch ar ge sp he res #1 and #2 are still  uncharged. 
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spheres #1 and  #2 both carry negative charge.  D) 
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sphere #1  carries positive charge and #2 carries negative charge.  E) 
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spheres #1 and  #2 both carry positive charge.  ans: D  Figure 21.6   4) 
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A point  charge  of mass  8.50  g 
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This document was uploaded on 09/05/2011.

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test1_ans(2) - Exam Name_

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