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Chapter 21: Electric Fields

Practice Test
      
  1.A 6.4-ΜF capacitor is first charged so that the electric potential difference is 5.0 V. How much additional charge is needed to increase the electric potential difference to 12.0 V?  
  a.   7.7 × 10-5 C  
  b.   7.7 × 105 C  
  c.   4.5 × 105 C  
  d.   4.5 × 10-5 C  
  Hint    
      
  2.What electric potential difference is applied to two metal plates 0.350 m apart if the electric field between them is 3.75 × 103 N/C?  
  a.   1.31 V  
  b.   1.07 × 104 V  
  c.   1.07 × 103 V  
  d.   1.31 × 103 V  
  Hint    
      
  3.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   away from, away from  
  b.   toward, away from  
  c.   away from, toward  
  d.   toward, toward  
  Hint    
      
  4.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   changes rapidly  
  b.   stationary  
  c.   downward  
  d.   upward  
  Hint    
      
  5.A voltmeter reads 450 V across two charged, parallel plates that are 5.0 cm apart. What is the electric field between them?  
  a.   1.1 × 10-4 N/C  
  b.   9.0 × 101 N/C  
  c.   9.0 × 103 N/C  
  d.   9.0 × 102 N/C  
  Hint    
      
  6.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   capacitor  
  b.   electric field  
  c.   equipotential  
  d.   potential  
  Hint    
      
  7.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   static  
  b.   grounding  
  c.   capacitance  
  d.   resistance  
  Hint    
      
  8.Electric potential difference is measured in __________.  
  a.   joules per coulomb  
  b.   volts per coulomb  
  c.   newtons per coulomb  
  d.   coulombs per joule  
  Hint    
      
  9.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   proportional to  
  b.   less than  
  c.   greater than  
  d.   equal to  
  Hint    
      
  10.Both a 1.2-ΜF and a 5.5-ΜF capacitor are connected across an 11-V electric potential difference. Which capacitor has the greater charge and what is it?  
  a.   1.2 ΜF; 6.1 × 10-5 C  
  b.   1.2 ΜF; 1.3 × 10-5 C  
  c.   5.5 ΜF; 1.6 × 10-5 C  
  d.   5.5 ΜF; 1.3 × 10-5 C  
  Hint    

 
   
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