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Chapter 21: Electric Fields

Practice Test
      
  1.Electric potential difference is measured in __________.  
  a.   newtons per coulomb  
  b.   joules per coulomb  
  c.   coulombs per joule  
  d.   volts per coulomb  
  Hint    
      
  2.The direction of the electric field is the direction of the__________.  
  a.   force on the positive test charge  
  b.   work done moving the test charge  
  c.   force on the negative test charge  
  d.   potential difference  
  Hint    
      
  3.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.   6.0 × 10-5 N/C  
  b.   1.7 × 103 N/C  
  c.   1.7 × 104 N/C  
  d.   0.49 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.   1.1 × 10-4 N/C  
  c.   9.0 × 103 N/C  
  d.   9.0 × 102 N/C  
  Hint    
      
  5.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    
      
  6.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 × 103 V  
  b.   1.31 V  
  c.   1.07 × 104 V  
  d.   1.31 × 103 V  
  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.   1.75 C  
  b.   1.8 × 103 C  
  c.   1.8 × 10-3 C  
  d.   1.4 × 10-6 C  
  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.   1.6 × 101 J/C  
  c.   negative 1.6 × 101 J  
  d.   7.8 × 10-1 J  
  Hint    
      
  9.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.   0.41 N/C  
  b.   4.1 N/C  
  c.   0.24 N/C  
  d.   2.4 N/C  
  Hint    
      
  10.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.   1.2 ΜF; 6.1 × 10-5 C  
  c.   5.5 ΜF; 1.6 × 10-5 C  
  d.   5.5 ΜF; 1.3 × 10-5 C  
  Hint    

 
   
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