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Chapter 21: Electric Fields

Practice Test
  1.The direction of the electric field is the direction of the__________.  
  a.   potential difference  
  b.   force on the negative test charge  
  c.   force on the positive test charge  
  d.   work done moving the test charge  
  2.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 × 10-5 C  
  d.   7.7 × 105 C  
  3.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   decreases  
  b.   doubles  
  c.   increases  
  d.   remains the same  
  4.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.   0.49 N/C  
  c.   1.7 × 104 N/C  
  d.   6.0 × 10-5 N/C  
  5.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 × 105 V  
  b.   7.8 × 102 V  
  c.   7.8 × 10-2 V  
  d.   7.8 × 104 V  
  6.The SI derived unit of potential difference is the __________.  
  a.   coulomb  
  b.   ohm  
  c.   joule  
  d.   volt  
  7.According to Coulomb's law, the force on a test charge is __________ the test charge.  
  a.   less than  
  b.   equal to  
  c.   proportional to  
  d.   greater than  
  8.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.   1.6 × 101 J/C  
  c.   1.6 × 101 J  
  d.   7.8 × 10-1 J  
  9.A positive test charge of 9.0 × 10-5 C is in an electric field that exerts a force of 3.7 × 10-5 N on it. What is the magnitude of the electric field at the location of the test charge?  
  a.   2.4 N/C  
  b.   0.41 N/C  
  c.   0.24 N/C  
  d.   4.1 N/C  
  10.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= F/q'  
  d.   E= q'/Fq'  

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