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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.   1.4 × 10-6 C  
  b.   1.8 × 103 C  
  c.   1.75 C  
  d.   1.8 × 10-3 C  
  2.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.   9.4 × 103 N/C  
  c.   1.1 × 10-4 N/C  
  d.   1.1 × 10-3 N/C  
  3.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   less than  
  b.   proportional to  
  c.   equal to  
  d.   greater than  
  4.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   decreases  
  b.   increases  
  c.   remains the same  
  d.   doubles  
  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.   6.0 × 10-5 N/C  
  b.   0.49 N/C  
  c.   1.7 × 104 N/C  
  d.   1.7 × 103 N/C  
  6.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.   0.24 N/C  
  d.   4.1 N/C  
  7.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= q/ΔV  
  b.   E= F/q'  
  c.   E= W/q'  
  d.   E= q'/Fq'  
  8.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   at equipotential  
  b.   polar  
  c.   in equilibrium  
  d.   close together  
  9.The ratio of charge stored to electric potential difference is called the __________.  
  a.   capacitor  
  b.   resistance  
  c.   current  
  d.   capacitance  
  10.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   equipotential  
  b.   capacitor  
  c.   potential  
  d.   electric field  

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