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Chapter 21: Electric Fields

Practice Test
  1.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  
  2.Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.  
  a.   away from, away from  
  b.   toward, toward  
  c.   toward, away from  
  d.   away from, toward  
  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.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  
  5.The electric field at the location of q' is represented by which of the following equations?  
  a.   E= F/q'  
  b.   E= W/q'  
  c.   E= q/ΔV  
  d.   E= q'/Fq'  
  6.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; 1.3 × 10-5 C  
  b.   5.5 ΜF; 1.6 × 10-5 C  
  c.   5.5 ΜF; 1.3 × 10-5 C  
  d.   1.2 ΜF; 6.1 × 10-5 C  
  7.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 × 10-5 C  
  d.   4.5 × 105 C  
  8.Electric potential difference is measured in __________.  
  a.   volts per coulomb  
  b.   coulombs per joule  
  c.   joules per coulomb  
  d.   newtons per coulomb  
  9.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  
  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.   2.0 × 105 N/C directed to the right  
  b.   4.5 × 10-7 N/C directed to the right  
  c.   4.5 X10-9 N/C directed to the left  
  d.   2.0 × 105 N/C directed to the left  

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