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Chapter 21: Electric Fields

Practice Test
      
  1.A voltmeter reads 450 V across two charged, parallel plates that are 5.0 cm apart. What is the electric field between them?  
  a.   9.0 × 103 N/C  
  b.   1.1 × 10-4 N/C  
  c.   9.0 × 101 N/C  
  d.   9.0 × 102 N/C  
  Hint    
      
  2.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 × 105 C  
  b.   4.5 × 105 C  
  c.   4.5 × 10-5 C  
  d.   7.7 × 10-5 C  
  Hint    
      
  3.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   close together  
  b.   polar  
  c.   in equilibrium  
  d.   at equipotential  
  Hint    
      
  4.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 × 104 V  
  b.   7.8 × 105 V  
  c.   7.8 × 10-2 V  
  d.   7.8 × 102 V  
  Hint    
      
  5.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 × 10-4 N/C  
  c.   9.4 × 103 N/C  
  d.   1.1 × 10-3 N/C  
  Hint    
      
  6.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= q'/Fq'  
  b.   E= W/q'  
  c.   E= F/q'  
  d.   E= q/ΔV  
  Hint    
      
  7.The direction of the electric field is the direction of the__________.  
  a.   work done moving the test charge  
  b.   potential difference  
  c.   force on the negative test charge  
  d.   force on the positive test charge  
  Hint    
      
  8.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   doubles  
  b.   remains the same  
  c.   decreases  
  d.   increases  
  Hint    
      
  9.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   greater than  
  b.   proportional to  
  c.   equal to  
  d.   less than  
  Hint    
      
  10.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 × 10-7 N/C directed to the right  
  b.   4.5 X10-9 N/C directed to the left  
  c.   2.0 × 105 N/C directed to the left  
  d.   2.0 × 105 N/C directed to the right  
  Hint    

 
   
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