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Chapter 21: Electric Fields

Practice Test
      
  1.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   increases  
  b.   doubles  
  c.   decreases  
  d.   remains the same  
  Hint    
      
  2.A negative charge of 1.5 × 10-7 C experiences a force of 0.030 N to the right in an electric field. What is the magnitude and direction of the field?  
  a.   2.0 × 105 N/C directed to the left  
  b.   2.0 × 105 N/C directed to the right  
  c.   4.5 × 10-7 N/C directed to the right  
  d.   4.5 X10-9 N/C directed to the left  
  Hint    
      
  3.If 200 J of work are performed to move one coulomb of charge from a positive plate to a negative plate, what potential difference exists between the plates?  
  a.   2.0 × 103 V  
  b.   200 V  
  c.   5.0 × 10-3 V  
  d.   1.6 × 10-19 V  
  Hint    
      
  4.The ratio of charge stored to electric potential difference is called the __________.  
  a.   capacitance  
  b.   resistance  
  c.   current  
  d.   capacitor  
  Hint    
      
  5.Electric potential difference is measured in __________.  
  a.   volts per coulomb  
  b.   newtons per coulomb  
  c.   joules per coulomb  
  d.   coulombs per joule  
  Hint    
      
  6.Two parallel plates are given opposite charges. A voltmeter measures the electric potential difference to be 47.0 V. The plates are 5.0 cm apart. What is the magnitude of the electric field between them?  
  a.   9.4 × 102 N/C  
  b.   1.1 × 10-3 N/C  
  c.   1.1 × 10-4 N/C  
  d.   9.4 × 103 N/C  
  Hint    
      
  7.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   resistance  
  b.   static  
  c.   capacitance  
  d.   grounding  
  Hint    
      
  8.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   away from, toward  
  b.   toward, away from  
  c.   toward, toward  
  d.   away from, away from  
  Hint    
      
  9.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   stationary  
  b.   upward  
  c.   changes rapidly  
  d.   downward  
  Hint    
      
  10.A 35-ΜF capacitor has an electric potential difference of 50.0 V across it. What is the charge on the capacitor?  
  a.   1.4 × 10-6 C  
  b.   1.8 × 10-3 C  
  c.   1.75 C  
  d.   1.8 × 103 C  
  Hint    

 
   
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