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Chapter 21: Electric Fields

Practice Test
      
  1.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= q'/Fq'  
  b.   E= F/q'  
  c.   E= W/q'  
  d.   E= q/ΔV  
  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.   9.0 × 103 N/C  
  b.   1.1 × 10-4 N/C  
  c.   9.0 × 102 N/C  
  d.   9.0 × 101 N/C  
  Hint    
      
  3.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   proportional to  
  b.   greater than  
  c.   equal to  
  d.   less than  
  Hint    
      
  4.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.   1.7 × 103 N/C  
  b.   6.0 × 10-5 N/C  
  c.   1.7 × 104 N/C  
  d.   0.49 N/C  
  Hint    
      
  5.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    
      
  6.Electric potential difference is measured in __________.  
  a.   newtons per coulomb  
  b.   joules per coulomb  
  c.   volts per coulomb  
  d.   coulombs per joule  
  Hint    
      
  7.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.   2.0 × 103 V  
  b.   5.0 × 10-3 V  
  c.   1.6 × 10-19 V  
  d.   200 V  
  Hint    
      
  8.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.   9.4 × 103 N/C  
  c.   1.1 × 10-3 N/C  
  d.   1.1 × 10-4 N/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.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 × 102 V  
  d.   7.8 × 104 V  
  Hint    

 
   
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