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Chapter 21: Electric Fields

Practice Test
      
  1.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 × 10-3 C  
  b.   1.75 C  
  c.   1.8 × 103 C  
  d.   1.4 × 10-6 C  
  Hint    
      
  2.In a Millikan oil drop experiment, a drop has been found to weigh 1.92 × 10-14 N. When the electric field is 3.0 × 104 N/C, the drop is suspended motionless. What is the charge on the oil drop?  
  a.   6.4 × 10-19 C  
  b.   5.8 × 10-19 C  
  c.   6.4 × 1019 C  
  d.   5.8 × 10-10 C  
  Hint    
      
  3.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.   7.7 × 10-5 C  
  c.   7.7 × 105 C  
  d.   4.5 × 10-5 C  
  Hint    
      
  4.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.   4.5 × 10-7 N/C directed to the right  
  d.   2.0 × 105 N/C directed to the right  
  Hint    
      
  5.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   in equilibrium  
  b.   close together  
  c.   polar  
  d.   at equipotential  
  Hint    
      
  6.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    
      
  7.The SI derived unit of potential difference is the __________.  
  a.   coulomb  
  b.   joule  
  c.   volt  
  d.   ohm  
  Hint    
      
  8.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   grounding  
  b.   resistance  
  c.   capacitance  
  d.   static  
  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.   1.7 × 103 N/C  
  b.   0.49 N/C  
  c.   1.7 × 104 N/C  
  d.   6.0 × 10-5 N/C  
  Hint    
      
  10.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 × 102 N/C  
  b.   9.0 × 103 N/C  
  c.   1.1 × 10-4 N/C  
  d.   9.0 × 101 N/C  
  Hint    

 
   
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