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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.   5.8 × 10-19 C  
  b.   6.4 × 10-19 C  
  c.   6.4 × 1019 C  
  d.   5.8 × 10-10 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.   1.1 × 10-4 N/C  
  b.   9.4 × 102 N/C  
  c.   1.1 × 10-3 N/C  
  d.   9.4 × 103 N/C  
  3.The ratio of charge stored to electric potential difference is called the __________.  
  a.   capacitor  
  b.   resistance  
  c.   capacitance  
  d.   current  
  4.The electric field intensity between two large, charged, parallel metal plates is 6500 N/C. The plates are 12 cm apart. What is the electric potential difference between them?  
  a.   7.8 × 10-2 V  
  b.   7.8 × 104 V  
  c.   7.8 × 102 V  
  d.   7.8 × 105 V  
  5.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   in equilibrium  
  b.   at equipotential  
  c.   polar  
  d.   close together  
  6.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  
  7.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   less than  
  b.   equal to  
  c.   greater than  
  d.   proportional to  
  8.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   capacitor  
  b.   potential  
  c.   electric field  
  d.   equipotential  
  9.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= q/ΔV  
  b.   E= q'/Fq'  
  c.   E= F/q'  
  d.   E= W/q'  
  10.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 × 104 N/C  
  b.   6.0 × 10-5 N/C  
  c.   1.7 × 103 N/C  
  d.   0.49 N/C  

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