Electromagnetism

Practice Test
      
  1.A proton moves at a speed of 7.9×103 m/s as it passes through and is perpendicular to a 0.45-T uniform magnetic field. Find the radius of the circular path.  
  a.   3.4×10-3 m  
  b.   1.0×10-4 m/s  
  c.   1.8×10-4 m  
  d.   5.6×10-7 m  
  Hint    
      
  2.The oscillations of a coil and capacitor circuit can be compared to a _________.  
  a.   pendulum  
  b.   merry-go-round  
  c.   parabolic path of a ball  
  d.   ship in orbit  
  Hint    
      
  3.An electron of mass 9.11×10-31 kg moves through a cathode-ray tube with a speed of 2.6×106 m/s across and perpendicular to a magnetic field of 4.2×10-2 T. The electric field is turned off. What is the radius of the circular path followed by the electron?  
  a.   8.1×10-1 m  
  b.   3.5×104 m  
  c.   3.5×10-4 m  
  d.   4.6×103 m  
  Hint    
      
  4.Energy carried in the form of electromagnetic waves is frequently called __________.  
  a.   oscillating rays  
  b.   electromagnetic radiation  
  c.   terminal energy  
  d.   electromotive force  
  Hint    

 
   
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