Electronics-Magnetism and Electrom

Electronics-Magnetism and Electrom
21. The Hall voltage is the voltage created by a conductor moving through a magnetic field.
  • TRUE
  • FALSE
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22. The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called hysteresis.
  • TRUE
  • FALSE
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23. Ferromagnetic materials have pre-existing magnetic fields.
  • TRUE
  • FALSE
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24. The unit of magnetic flux is the weber.
  • TRUE
  • FALSE
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25. A voltage is induced across a conductor if it remains absolutely stationary within a magnetic field.
  • TRUE
  • FALSE
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26. A magnetic material such as iron can change the course of magnetic lines of force.
  • TRUE
  • FALSE
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27. The induced emf of a conductor cutting flux lines is directly proportional to the rate of cutting.
  • TRUE
  • FALSE
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28. The magnetic field, current through the Hall element, and Hall voltage are all at right angles to each other.
  • TRUE
  • FALSE
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29. The operation of an electrical generator relies on electromagnetic induction.
  • TRUE
  • FALSE
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30. What device is similar to an RTD but has a negative temperature coefficient?
  • Strain gauge
  • Thermistor
  • Negative-type RTD
  • Thermocouple
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Electronics
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