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Chapter 21: Electric Fields

Practice Test
      
  1.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    
      
  2.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    
      
  3.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.   1.07 × 104 V  
  b.   1.07 × 103 V  
  c.   1.31 V  
  d.   1.31 × 103 V  
  Hint    
      
  4.The SI derived unit of potential difference is the __________.  
  a.   volt  
  b.   coulomb  
  c.   ohm  
  d.   joule  
  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.   1.4 × 10-6 C  
  b.   1.8 × 10-3 C  
  c.   1.8 × 103 C  
  d.   1.75 C  
  Hint    
      
  6.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 × 10-5 C  
  c.   4.5 × 105 C  
  d.   7.7 × 105 C  
  Hint    
      
  7.Electric potential difference is measured in __________.  
  a.   newtons per coulomb  
  b.   volts per coulomb  
  c.   coulombs per joule  
  d.   joules per coulomb  
  Hint    
      
  8.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.   200 V  
  b.   2.0 × 103 V  
  c.   5.0 × 10-3 V  
  d.   1.6 × 10-19 V  
  Hint    
      
  9.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 × 103 N/C  
  c.   9.0 × 101 N/C  
  d.   9.0 × 102 N/C  
  Hint    
      
  10.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   electric field  
  b.   capacitor  
  c.   potential  
  d.   equipotential  
  Hint    

 
   
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