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Chapter 21: Electric Fields

Practice Test
  1.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; 1.3 × 10-5 C  
  b.   1.2 ΜF; 6.1 × 10-5 C  
  c.   5.5 ΜF; 1.3 × 10-5 C  
  d.   5.5 ΜF; 1.6 × 10-5 C  
  2.What work is done when 3.5 C is moved through an electric potential difference of 4.5 V?  
  a.   negative 1.6 × 101 J  
  b.   7.8 × 10-1 J  
  c.   1.6 × 101 J  
  d.   1.6 × 101 J/C  
  3.A negative charge of 1.5 × 10-7 C experiences a force of 0.030 N to the right in an electric field. What is the magnitude and direction of the field?  
  a.   4.5 × 10-7 N/C directed to the right  
  b.   2.0 × 105 N/C directed to the right  
  c.   4.5 X10-9 N/C directed to the left  
  d.   2.0 × 105 N/C directed to the left  
  4.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   proportional to  
  b.   equal to  
  c.   greater than  
  d.   less than  
  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 × 101 N/C  
  c.   9.0 × 103 N/C  
  d.   9.0 × 102 N/C  
  6.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 × 103 N/C  
  b.   6.0 × 10-5 N/C  
  c.   0.49 N/C  
  d.   1.7 × 104 N/C  
  7.The direction of the electric field is the direction of the__________.  
  a.   force on the negative test charge  
  b.   work done moving the test charge  
  c.   force on the positive test charge  
  d.   potential difference  
  8.When the electric potential difference between two positions in an electric field is zero, the positions are __________.  
  a.   polar  
  b.   close together  
  c.   at equipotential  
  d.   in equilibrium  
  9.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 × 10-2 V  
  c.   7.8 × 105 V  
  d.   7.8 × 102 V  
  10.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   electric field  
  b.   equipotential  
  c.   capacitor  
  d.   potential  

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