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Two capacitor plates 2 mm apart have 200 V between them. The field between them is

  • A.0.4 V/m
  • B.100 V/m
  • C.100 kV/m
  • D.400 V/m

Answer: C

For a uniform field the magnitude is the potential difference divided by the separation, \( 200/0.002 = 10^{5} \) V/m. The result is close to the breakdown strength of many gases, which is why capacitor spacings are chosen with care.

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