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Chapter 21: Electric Fields

Practice Test
  1.Electric potential difference is measured in __________.  
  a.   volts per coulomb  
  b.   coulombs per joule  
  c.   newtons per coulomb  
  d.   joules per coulomb  
  2.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.   2.4 N/C  
  c.   4.1 N/C  
  d.   0.24 N/C  
  3.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   close together  
  b.   in equilibrium  
  c.   at equipotential  
  d.   polar  
  4.What work is done when 3.5 C is moved through an electric potential difference of 4.5 V?  
  a.   negative 1.6 × 101 J  
  b.   1.6 × 101 J/C  
  c.   7.8 × 10-1 J  
  d.   1.6 × 101 J  
  5.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 × 10-4 N/C  
  c.   1.1 × 10-3 N/C  
  d.   9.4 × 103 N/C  
  6.The ratio of charge stored to electric potential difference is called the __________.  
  a.   current  
  b.   capacitance  
  c.   capacitor  
  d.   resistance  
  7.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   toward, away from  
  b.   toward, toward  
  c.   away from, toward  
  d.   away from, away from  
  8.A voltmeter reads 450 V across two charged, parallel plates that are 5.0 cm apart. What is the electric field between them?  
  a.   1.1 × 10-4 N/C  
  b.   9.0 × 101 N/C  
  c.   9.0 × 103 N/C  
  d.   9.0 × 102 N/C  
  9.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   downward  
  b.   changes rapidly  
  c.   upward  
  d.   stationary  
  10.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= F/q'  
  b.   E= q'/Fq'  
  c.   E= q/ΔV  
  d.   E= W/q'  

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