If the electric field inside a capacitor exceeds about 3 times 10^6 V/m, the few
ID: 1506579 • Letter: I
Question
If the electric field inside a capacitor exceeds about 3 times 10^6 V/m, the few free electrons in the air are accelerated enough to trigger an avalanche and make a spark. In the spark shown in the diagram, electrons are accelerated upward and positive ions are accelerated downward. Which arrow best indicates the direction of propagation of electromagnetic radiation reaching location B? Which arrow best indicates the direction of propagation of electromagnetic radiation reaching location C? What is the direction of the radiative electric field observed at location B? What is the direction of the radiative electric field observed at location C? What is the direction of the radiative magnetic field observed at location B? What is the direction of the radiative magnetic field observed at location C?Explanation / Answer
The direction of propagation of electromagnetic radiation reaching location B is: c
The direction of propagation of electromagnetic radiation reaching location C is: d
The direction of the radiative electric field observed at location B must be perpendicular to the direction of electromagnetic radiation reaching location B, so is: a
The direction of the radiative electric field observed at location C must be perpendicular to the direction of electromagnetic radiation reaching location C, so is: b
The direction of the radiative magnetic field observed at location B must be perpendicular to both of the previous answers because the magnetic field is perpendicular to the electric field, so is: j
The direction of the radiative magnetic field observed at location C also coincides with: j
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