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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.   4.5 × 10-5 C  
  b.   7.7 × 105 C  
  c.   4.5 × 105 C  
  d.   7.7 × 10-5 C  
  Hint    
      
  2.The direction of the electric field is the direction of the__________.  
  a.   force on the positive test charge  
  b.   force on the negative test charge  
  c.   potential difference  
  d.   work done moving the test charge  
  Hint    
      
  3.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   equal to  
  b.   less than  
  c.   greater than  
  d.   proportional to  
  Hint    
      
  4.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   upward  
  b.   downward  
  c.   stationary  
  d.   changes rapidly  
  Hint    
      
  5.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   away from, toward  
  b.   toward, toward  
  c.   away from, away from  
  d.   toward, away from  
  Hint    
      
  6.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   equipotential  
  b.   electric field  
  c.   capacitor  
  d.   potential  
  Hint    
      
  7.The electric field intensity between two large, charged, parallel metal plates is 6500 N/C. The plates are 12 cm apart. What is the electric potential difference between them?  
  a.   7.8 × 10-2 V  
  b.   7.8 × 105 V  
  c.   7.8 × 104 V  
  d.   7.8 × 102 V  
  Hint    
      
  8.The SI derived unit of potential difference is the __________.  
  a.   coulomb  
  b.   joule  
  c.   ohm  
  d.   volt  
  Hint    
      
  9.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    
      
  10.In a Millikan oil drop experiment, a drop has been found to weigh 1.92 × 10-14 N. When the electric field is 3.0 × 104 N/C, the drop is suspended motionless. What is the charge on the oil drop?  
  a.   6.4 × 1019 C  
  b.   5.8 × 10-10 C  
  c.   6.4 × 10-19 C  
  d.   5.8 × 10-19 C  
  Hint    

 
   
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