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Chapter 21: Electric Fields

Practice Test
  1.The SI derived unit of potential difference is the __________.  
  a.   volt  
  b.   ohm  
  c.   joule  
  d.   coulomb  
  2.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.   0.41 N/C  
  b.   2.4 N/C  
  c.   4.1 N/C  
  d.   0.24 N/C  
  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 × 10-2 V  
  c.   7.8 × 104 V  
  d.   7.8 × 105 V  
  4.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   remains the same  
  b.   decreases  
  c.   increases  
  d.   doubles  
  5.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; 6.1 × 10-5 C  
  b.   1.2 ΜF; 1.3 × 10-5 C  
  c.   5.5 ΜF; 1.3 × 10-5 C  
  d.   5.5 ΜF; 1.6 × 10-5 C  
  6.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.   7.7 × 10-5 C  
  d.   4.5 × 105 C  
  7.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= W/q'  
  b.   E= F/q'  
  c.   E= q/ΔV  
  d.   E= q'/Fq'  
  8.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  
  9.Electric potential difference is measured in __________.  
  a.   joules per coulomb  
  b.   newtons per coulomb  
  c.   coulombs per joule  
  d.   volts per coulomb  
  10.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   equipotential  
  b.   potential  
  c.   capacitor  
  d.   electric field  

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