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Chapter 21: Electric Fields

Practice Test
      
  1.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    
      
  2.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   toward, away from  
  b.   away from, toward  
  c.   away from, away from  
  d.   toward, toward  
  Hint    
      
  3.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    
      
  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.   6.0 × 10-5 N/C  
  b.   1.7 × 103 N/C  
  c.   0.49 N/C  
  d.   1.7 × 104 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 × 105 C  
  b.   4.5 × 10-5 C  
  c.   7.7 × 10-5 C  
  d.   7.7 × 105 C  
  Hint    
      
  6.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.   5.5 ΜF; 1.6 × 10-5 C  
  b.   1.2 ΜF; 6.1 × 10-5 C  
  c.   1.2 ΜF; 1.3 × 10-5 C  
  d.   5.5 ΜF; 1.3 × 10-5 C  
  Hint    
      
  7.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    
      
  8.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 × 103 V  
  c.   1.07 × 104 V  
  d.   1.31 V  
  Hint    
      
  9.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 X10-9 N/C directed to the left  
  b.   2.0 × 105 N/C directed to the left  
  c.   2.0 × 105 N/C directed to the right  
  d.   4.5 × 10-7 N/C directed to the right  
  Hint    
      
  10.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 × 10-3 N/C  
  c.   1.1 × 10-4 N/C  
  d.   9.4 × 103 N/C  
  Hint    

 
   
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