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Chapter 21: Electric Fields

Practice Test
      
  1.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; 1.3 × 10-5 C  
  b.   5.5 ΜF; 1.3 × 10-5 C  
  c.   5.5 ΜF; 1.6 × 10-5 C  
  d.   1.2 ΜF; 6.1 × 10-5 C  
  Hint    
      
  2.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   decreases  
  b.   remains the same  
  c.   increases  
  d.   doubles  
  Hint    
      
  3.A positive test charge of 9.0 × 10-5 C is in an electric field that exerts a force of 3.7 × 10-5 N on it. What is the magnitude of the electric field at the location of the test charge?  
  a.   0.24 N/C  
  b.   4.1 N/C  
  c.   0.41 N/C  
  d.   2.4 N/C  
  Hint    
      
  4.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 × 101 N/C  
  b.   9.0 × 103 N/C  
  c.   1.1 × 10-4 N/C  
  d.   9.0 × 102 N/C  
  Hint    
      
  5.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.   5.0 × 10-3 V  
  b.   2.0 × 103 V  
  c.   200 V  
  d.   1.6 × 10-19 V  
  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.   1.1 × 10-3 N/C  
  b.   9.4 × 102 N/C  
  c.   9.4 × 103 N/C  
  d.   1.1 × 10-4 N/C  
  Hint    
      
  7.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.   1.4 × 10-6 C  
  c.   1.75 C  
  d.   1.8 × 10-3 C  
  Hint    
      
  8.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 × 10-2 V  
  c.   7.8 × 102 V  
  d.   7.8 × 105 V  
  Hint    
      
  9.An electric field is to be measured using a positive test charge of 3.0 × 10-5C. This test charge experiences a force of 0.50 N acting at an angle of 15 degrees. What is the magnitude of the electric field at the location of the test charge?  
  a.   0.49 N/C  
  b.   1.7 × 104 N/C  
  c.   1.7 × 103 N/C  
  d.   6.0 × 10-5 N/C  
  Hint    
      
  10.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   grounding  
  b.   static  
  c.   resistance  
  d.   capacitance  
  Hint    

 
   
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