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Chapter 21: Electric Fields

Practice Test
  1.The direction of the electric field is the direction of the__________.  
  a.   force on the negative test charge  
  b.   work done moving the test charge  
  c.   force on the positive test charge  
  d.   potential difference  
  2.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   at equipotential  
  b.   in equilibrium  
  c.   polar  
  d.   close together  
  3.A 35-ΜF capacitor has an electric potential difference of 50.0 V across it. What is the charge on the capacitor?  
  a.   1.8 × 10-3 C  
  b.   1.4 × 10-6 C  
  c.   1.75 C  
  d.   1.8 × 103 C  
  4.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   changes rapidly  
  b.   upward  
  c.   downward  
  d.   stationary  
  5.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.   0.49 N/C  
  b.   6.0 × 10-5 N/C  
  c.   1.7 × 103 N/C  
  d.   1.7 × 104 N/C  
  6.Electric potential difference is measured in __________.  
  a.   joules per coulomb  
  b.   volts per coulomb  
  c.   newtons per coulomb  
  d.   coulombs per joule  
  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 × 102 N/C  
  b.   1.1 × 10-4 N/C  
  c.   9.0 × 101 N/C  
  d.   9.0 × 103 N/C  
  8.The ratio of charge stored to electric potential difference is called the __________.  
  a.   capacitance  
  b.   current  
  c.   capacitor  
  d.   resistance  
  9.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   grounding  
  b.   resistance  
  c.   capacitance  
  d.   static  
  10.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   less than  
  b.   greater than  
  c.   equal to  
  d.   proportional to  

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