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Chapter 21: Electric Fields

Practice Test
  1.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 × 10-19 C  
  c.   6.4 × 1019 C  
  d.   5.8 × 10-10 C  
  2.An electric field is about 150 N/C downward. What is the direction of the force on a positively-charged particle?  
  a.   stationary  
  b.   downward  
  c.   changes rapidly  
  d.   upward  
  3.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'  
  4.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.   9.4 × 102 N/C  
  c.   9.4 × 103 N/C  
  d.   1.1 × 10-4 N/C  
  5.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.   6.0 × 10-5 N/C  
  c.   0.49 N/C  
  d.   1.7 × 104 N/C  
  6.The SI derived unit of potential difference is the __________.  
  a.   joule  
  b.   volt  
  c.   coulomb  
  d.   ohm  
  7.As a positive test charge moves farther from a positive charge in an electric field, the potential energy __________.  
  a.   remains the same  
  b.   doubles  
  c.   decreases  
  d.   increases  
  8.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.   7.7 × 10-5 C  
  b.   7.7 × 105 C  
  c.   4.5 × 105 C  
  d.   4.5 × 10-5 C  
  9.The __________ is a vector quantity that relates the force on a test charge to the size of the charge.  
  a.   electric field  
  b.   potential  
  c.   equipotential  
  d.   capacitor  
  10.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.   4.5 × 10-7 N/C directed to the right  
  b.   2.0 × 105 N/C directed to the right  
  c.   2.0 × 105 N/C directed to the left  
  d.   4.5 X10-9 N/C directed to the left  

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