Discussion
The electric potential of the electrosphere is positive with respect to Earth and its magnitude is about :
Answer: C
The potential is about 300 kV.
In the global atmospheric electric circuit, thunderstorms act as generators that charge the upper atmosphere (the electrosphere, at the base of the ionosphere) positively relative to the ground. Measurements put this potential difference at roughly 250-300 kV, and fair-weather current leaks back down through the conducting air.
30 kV is an order of magnitude too low, and 1000 kV and 3000 kV are several times too high.
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