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Chapter 21: Electric Fields

Practice Test
  1.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 × 103 C  
  b.   1.75 C  
  c.   1.8 × 10-3 C  
  d.   1.4 × 10-6 C  
  2.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   away from, away from  
  b.   toward, toward  
  c.   toward, away from  
  d.   away from, toward  
  3.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 × 102 V  
  b.   7.8 × 105 V  
  c.   7.8 × 104 V  
  d.   7.8 × 10-2 V  
  4.What work is done when 3.5 C is moved through an electric potential difference of 4.5 V?  
  a.   1.6 × 101 J  
  b.   7.8 × 10-1 J  
  c.   negative 1.6 × 101 J  
  d.   1.6 × 101 J/C  
  5.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 × 104 V  
  b.   1.31 V  
  c.   1.31 × 103 V  
  d.   1.07 × 103 V  
  6.The direction of the electric field is the direction of the__________.  
  a.   force on the positive test charge  
  b.   potential difference  
  c.   force on the negative test charge  
  d.   work done moving the test charge  
  7.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.   4.5 × 10-5 C  
  b.   4.5 × 105 C  
  c.   7.7 × 105 C  
  d.   7.7 × 10-5 C  
  8.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   electric field  
  b.   capacitor  
  c.   potential  
  d.   equipotential  
  9.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= q'/Fq'  
  b.   E= q/ΔV  
  c.   E= F/q'  
  d.   E= W/q'  
  10.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   equal to  
  b.   greater than  
  c.   less than  
  d.   proportional to  

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