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Chapter 21: Electric Fields

Practice Test
  1.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.   negative 1.6 × 101 J  
  c.   7.8 × 10-1 J  
  d.   1.6 × 101 J  
  2.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   electric field  
  b.   potential  
  c.   capacitor  
  d.   equipotential  
  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.   1.31 V  
  b.   1.07 × 103 V  
  c.   1.31 × 103 V  
  d.   1.07 × 104 V  
  4.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= q/ΔV  
  b.   E= W/q'  
  c.   E= q'/Fq'  
  d.   E= F/q'  
  5.The direction of the electric field is the direction of the__________.  
  a.   potential difference  
  b.   force on the positive test charge  
  c.   work done moving the test charge  
  d.   force on the negative test charge  
  6.A 6.4-ΜF capacitor is first charged so that the electric potential difference is 5.0 V. How much additional charge is needed to increase the electric potential difference to 12.0 V?  
  a.   7.7 × 105 C  
  b.   4.5 × 105 C  
  c.   4.5 × 10-5 C  
  d.   7.7 × 10-5 C  
  7.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   static  
  b.   grounding  
  c.   capacitance  
  d.   resistance  
  8.The ratio of charge stored to electric potential difference is called the __________.  
  a.   resistance  
  b.   capacitor  
  c.   current  
  d.   capacitance  
  9.Electric potential difference is measured in __________.  
  a.   coulombs per joule  
  b.   volts per coulomb  
  c.   joules per coulomb  
  d.   newtons per coulomb  
  10.The SI derived unit of potential difference is the __________.  
  a.   joule  
  b.   ohm  
  c.   volt  
  d.   coulomb  

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