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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.   work done moving the test charge  
  d.   force on the positive test charge  
  2.The ratio of charge stored to electric potential difference is called the __________.  
  a.   resistance  
  b.   current  
  c.   capacitance  
  d.   capacitor  
  3.Touching a body to Earth to eliminate excess charge is called __________.  
  a.   resistance  
  b.   grounding  
  c.   capacitance  
  d.   static  
  4.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 × 105 C  
  b.   4.5 × 10-5 C  
  c.   7.7 × 10-5 C  
  d.   7.7 × 105 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 × 104 N/C  
  b.   6.0 × 10-5 N/C  
  c.   1.7 × 103 N/C  
  d.   0.49 N/C  
  6.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 left  
  c.   2.0 × 105 N/C directed to the right  
  d.   4.5 X10-9 N/C directed to the left  
  7.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'  
  8.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 × 10-3 C  
  b.   1.8 × 103 C  
  c.   1.4 × 10-6 C  
  d.   1.75 C  
  9.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.   1.07 × 103 V  
  b.   1.31 V  
  c.   1.07 × 104 V  
  d.   1.31 × 103 V  
  10.Electric potential difference is measured in __________.  
  a.   newtons per coulomb  
  b.   joules per coulomb  
  c.   volts per coulomb  
  d.   coulombs per joule  

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