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Chapter 21: Electric Fields

Practice Test
  1.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 × 1019 C  
  b.   6.4 × 10-19 C  
  c.   5.8 × 10-19 C  
  d.   5.8 × 10-10 C  
  2.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   decreases  
  b.   remains the same  
  c.   increases  
  d.   doubles  
  3.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   capacitance  
  b.   grounding  
  c.   resistance  
  d.   static  
  4.The direction of the electric field is the direction of the__________.  
  a.   potential difference  
  b.   force on the positive test charge  
  c.   force on the negative test charge  
  d.   work done moving the test charge  
  5.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.   2.4 N/C  
  b.   0.41 N/C  
  c.   0.24 N/C  
  d.   4.1 N/C  
  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/C  
  b.   7.8 × 10-1 J  
  c.   negative 1.6 × 101 J  
  d.   1.6 × 101 J  
  7.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   greater than  
  b.   proportional to  
  c.   less than  
  d.   equal to  
  8.Electric potential difference is measured in __________.  
  a.   newtons per coulomb  
  b.   volts per coulomb  
  c.   coulombs per joule  
  d.   joules per coulomb  
  9.The SI derived unit of potential difference is the __________.  
  a.   coulomb  
  b.   ohm  
  c.   joule  
  d.   volt  
  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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