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Chapter 21: Electric Fields

Practice Test
      
  1.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   toward, away from  
  b.   toward, toward  
  c.   away from, toward  
  d.   away from, away from  
  Hint    
      
  2.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 × 102 N/C  
  d.   9.0 × 103 N/C  
  Hint    
      
  3.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.   4.5 X10-9 N/C directed to the left  
  b.   2.0 × 105 N/C directed to the left  
  c.   2.0 × 105 N/C directed to the right  
  d.   4.5 × 10-7 N/C directed to the right  
  Hint    
      
  4.The SI derived unit of potential difference is the __________.  
  a.   ohm  
  b.   joule  
  c.   volt  
  d.   coulomb  
  Hint    
      
  5.A 35-ΜF capacitor has an electric potential difference of 50.0 V across it. What is the charge on the capacitor?  
  a.   1.8 × 103 C  
  b.   1.8 × 10-3 C  
  c.   1.75 C  
  d.   1.4 × 10-6 C  
  Hint    
      
  6.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 × 105 V  
  b.   7.8 × 10-2 V  
  c.   7.8 × 102 V  
  d.   7.8 × 104 V  
  Hint    
      
  7.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.   potential  
  d.   capacitor  
  Hint    
      
  8.What work is done when 3.5 C is moved through an electric potential difference of 4.5 V?  
  a.   1.6 × 101 J  
  b.   negative 1.6 × 101 J  
  c.   7.8 × 10-1 J  
  d.   1.6 × 101 J/C  
  Hint    
      
  9.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 × 105 C  
  b.   4.5 × 10-5 C  
  c.   7.7 × 10-5 C  
  d.   7.7 × 105 C  
  Hint    
      
  10.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 × 103 V  
  c.   1.31 × 103 V  
  d.   1.07 × 104 V  
  Hint    

 
   
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