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Chapter 21: Electric Fields

Practice Test
  1.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.   1.07 × 103 V  
  c.   1.31 × 103 V  
  d.   1.31 V  
  2.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.   1.6 × 10-19 V  
  b.   2.0 × 103 V  
  c.   200 V  
  d.   5.0 × 10-3 V  
  3.The direction of the electric field is the direction of the__________.  
  a.   work done moving the test charge  
  b.   force on the positive test charge  
  c.   potential difference  
  d.   force on the negative test charge  
  4.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   toward, away from  
  b.   away from, away from  
  c.   toward, toward  
  d.   away from, toward  
  5.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   remains the same  
  b.   increases  
  c.   decreases  
  d.   doubles  
  6.In a Millikan oil drop experiment, a drop has been found to weigh 1.92 × 10-14 N. When the electric field is 3.0 × 104 N/C, the drop is suspended motionless. What is the charge on the oil drop?  
  a.   5.8 × 10-19 C  
  b.   6.4 × 1019 C  
  c.   6.4 × 10-19 C  
  d.   5.8 × 10-10 C  
  7.Electric potential difference is measured in __________.  
  a.   newtons per coulomb  
  b.   volts per coulomb  
  c.   joules per coulomb  
  d.   coulombs per joule  
  8.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.   6.0 × 10-5 N/C  
  b.   1.7 × 104 N/C  
  c.   0.49 N/C  
  d.   1.7 × 103 N/C  
  9.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  
  10.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   proportional to  
  b.   less than  
  c.   greater than  
  d.   equal to  

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