Electromagnetism

Practice Test
      
  1.Protons passing perpendicular to and without deflection through a uniform magnetic field of 0.54 T are balanced by a 5.4×103-N/C electric field. What is the speed of the moving protons?  
  a.   1.0×10-4 m/s  
  b.   9.0×103 m/s  
  c.   1.0×104 m/s  
  d.   9.0×10- 3 m/s  
  Hint    
      
  2.A stream of singly ionized atoms is not deflected as it passes through a 2.4×10-3-T magnetic field perpendicular to a 4.7×102-V/m electric field. The atoms then move into a magnetic field of 0.31 T and follow a circular path of radius 0.175 m. What is the mass of each of these atoms?  
  a.   8.7×10-21 kg  
  b.   4.3×10-26 kg  
  c.   2.4×10-16 kg  
  d.   4.3×10-16 kg  
  Hint    
      
  3.What occurs in a material that has the property of piezoelectricity?  
  a.   It produces a beam of light when it enters a magnetic field.  
  b.   It bends or deforms when a voltage is applied across it.  
  c.   It amplifies sound waves.  
  d.   It emits infrared radiation.  
  Hint    
      
  4.A receiver is a combination of ____________.  
  a.   an antenna, a coil and capacitor circuit, and an amplifier  
  b.   an antenna, a capacitor circuit, and a resonator  
  c.   a coil and capacitor circuit  
  d.   an antenna and an amplifier  
  Hint    

 
   
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