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Chapter 21: Electric Fields

Practice Test
  1.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   capacitance  
  b.   grounding  
  c.   static  
  d.   resistance  
  2.The direction of the electric field is the direction of the__________.  
  a.   potential difference  
  b.   work done moving the test charge  
  c.   force on the positive test charge  
  d.   force on the negative test charge  
  3.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.   1.07 × 103 V  
  b.   1.31 × 103 V  
  c.   1.31 V  
  d.   1.07 × 104 V  
  4.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.   200 V  
  b.   1.6 × 10-19 V  
  c.   2.0 × 103 V  
  d.   5.0 × 10-3 V  
  5.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  
  6.Both a 1.2-ΜF and a 5.5-ΜF capacitor are connected across an 11-V electric potential difference. Which capacitor has the greater charge and what is it?  
  a.   1.2 ΜF; 6.1 × 10-5 C  
  b.   5.5 ΜF; 1.6 × 10-5 C  
  c.   1.2 ΜF; 1.3 × 10-5 C  
  d.   5.5 ΜF; 1.3 × 10-5 C  
  7.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.   0.24 N/C  
  c.   4.1 N/C  
  d.   2.4 N/C  
  8.Electric potential difference is measured in __________.  
  a.   volts per coulomb  
  b.   newtons per coulomb  
  c.   coulombs per joule  
  d.   joules per coulomb  
  9.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 × 103 N/C  
  d.   9.0 × 101 N/C  
  10.The SI derived unit of potential difference is the __________.  
  a.   volt  
  b.   coulomb  
  c.   joule  
  d.   ohm  

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