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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.   1.31 V  
  b.   1.07 × 103 V  
  c.   1.07 × 104 V  
  d.   1.31 × 103 V  
  2.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= W/q'  
  b.   E= q'/Fq'  
  c.   E= q/ΔV  
  d.   E= F/q'  
  3.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   downward  
  b.   changes rapidly  
  c.   upward  
  d.   stationary  
  4.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   resistance  
  b.   capacitance  
  c.   grounding  
  d.   static  
  5.The SI derived unit of potential difference is the __________.  
  a.   joule  
  b.   coulomb  
  c.   ohm  
  d.   volt  
  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.   6.4 × 1019 C  
  b.   5.8 × 10-10 C  
  c.   6.4 × 10-19 C  
  d.   5.8 × 10-19 C  
  7.Two parallel plates are given opposite charges. A voltmeter measures the electric potential difference to be 47.0 V. The plates are 5.0 cm apart. What is the magnitude of the electric field between them?  
  a.   1.1 × 10-3 N/C  
  b.   1.1 × 10-4 N/C  
  c.   9.4 × 103 N/C  
  d.   9.4 × 102 N/C  
  8.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 × 105 V  
  d.   7.8 × 104 V  
  9.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   potential  
  b.   electric field  
  c.   equipotential  
  d.   capacitor  
  10.A 35-ΜF capacitor has an electric potential difference of 50.0 V across it. What is the charge on the capacitor?  
  a.   1.8 × 103 C  
  b.   1.4 × 10-6 C  
  c.   1.8 × 10-3 C  
  d.   1.75 C  

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