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The reason a general purpose oscilloscope uses electrostatic rather than electromagnetic deflection is that electrostatic deflection

  • A.produces a spot that stays in focus over the whole screen
  • B.works to far higher frequencies
  • C.gives a much larger deflection for a given input signal
  • D.needs no power supply of its own for the deflection plates

Answer: B

Deflection coils are inductive and their impedance rises with frequency, so driving them at megahertz rates is impractical. Plates present a small capacitance and can be driven to hundreds of megahertz, which is what an oscilloscope needs above all else.

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