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Chapter 21: Electric Fields

Practice Test
  1.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.   7.7 × 105 C  
  c.   4.5 × 105 C  
  d.   7.7 × 10-5 C  
  2.The direction of the electric field is the direction of the__________.  
  a.   force on the positive test charge  
  b.   force on the negative test charge  
  c.   potential difference  
  d.   work done moving the test charge  
  3.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   equal to  
  b.   less than  
  c.   greater than  
  d.   proportional to  
  4.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   upward  
  b.   downward  
  c.   stationary  
  d.   changes rapidly  
  5.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   away from, toward  
  b.   toward, toward  
  c.   away from, away from  
  d.   toward, away from  
  6.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   equipotential  
  b.   electric field  
  c.   capacitor  
  d.   potential  
  7.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 × 10-2 V  
  b.   7.8 × 105 V  
  c.   7.8 × 104 V  
  d.   7.8 × 102 V  
  8.The SI derived unit of potential difference is the __________.  
  a.   coulomb  
  b.   joule  
  c.   ohm  
  d.   volt  
  9.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.   2.0 × 105 N/C directed to the left  
  b.   2.0 × 105 N/C directed to the right  
  c.   4.5 × 10-7 N/C directed to the right  
  d.   4.5 X10-9 N/C directed to the left  
  10.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.   6.4 × 1019 C  
  b.   5.8 × 10-10 C  
  c.   6.4 × 10-19 C  
  d.   5.8 × 10-19 C  

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