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Chapter 21: Electric Fields

Practice Test
  1.If 200 J of work are performed to move one coulomb of charge from a positive plate to a negative plate, what potential difference exists between the plates?  
  a.   1.6 × 10-19 V  
  b.   200 V  
  c.   5.0 × 10-3 V  
  d.   2.0 × 103 V  
  2.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   static  
  b.   grounding  
  c.   capacitance  
  d.   resistance  
  3.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.   4.1 N/C  
  c.   0.41 N/C  
  d.   0.24 N/C  
  4.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.   1.75 C  
  c.   1.4 × 10-6 C  
  d.   1.8 × 103 C  
  5.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 × 102 N/C  
  c.   9.0 × 101 N/C  
  d.   9.0 × 103 N/C  
  6.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  
  7.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.   5.8 × 10-19 C  
  c.   5.8 × 10-10 C  
  d.   6.4 × 10-19 C  
  8.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.   0.49 N/C  
  c.   6.0 × 10-5 N/C  
  d.   1.7 × 103 N/C  
  9.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   doubles  
  b.   remains the same  
  c.   decreases  
  d.   increases  
  10.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   polar  
  b.   close together  
  c.   in equilibrium  
  d.   at equipotential  

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