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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.   2.0 × 103 V  
  b.   5.0 × 10-3 V  
  c.   200 V  
  d.   1.6 × 10-19 V  
  2.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   decreases  
  b.   increases  
  c.   doubles  
  d.   remains the same  
  3.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   toward, toward  
  b.   away from, toward  
  c.   away from, away from  
  d.   toward, away from  
  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 × 104 V  
  b.   7.8 × 105 V  
  c.   7.8 × 10-2 V  
  d.   7.8 × 102 V  
  5.The SI derived unit of potential difference is the __________.  
  a.   volt  
  b.   ohm  
  c.   coulomb  
  d.   joule  
  6.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= F/q'  
  b.   E= q/ΔV  
  c.   E= W/q'  
  d.   E= q'/Fq'  
  7.What electric potential difference is applied to two metal plates 0.350 m apart if the electric field between them is 3.75 × 103 N/C?  
  a.   1.31 V  
  b.   1.31 × 103 V  
  c.   1.07 × 103 V  
  d.   1.07 × 104 V  
  8.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   proportional to  
  b.   greater than  
  c.   equal to  
  d.   less than  
  9.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   polar  
  b.   at equipotential  
  c.   in equilibrium  
  d.   close together  
  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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