# Electrospheres/Quiz

The Earth is electrically charged and acts as a spherical capacitor. Credit: Natural Resources of Canada.

The lecture and article on electrospheres is part of a series on the geophysics of the Earth.

You are free to take this quiz based on electrospheres at any time.

To improve your scores, read and study the lecture, the links contained within, listed under See also, External links, and in the `{{charge ontology}}` and `{{repellor vehicle}}` templates. This should give you adequate background to get 100 %.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

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Enjoy learning by doing!

## Quiz

 Point added for a correct answer: Points for an incorrect answer: Ignore the questions' coefficients:

1

Complete the text:

 Any capacitor, unless it is altered, has a capacitance.

2

Yes or No, The rate of change of charge depends on the initial value of the charge itself.

 Yes No

3

True or False, If charge is stored, it can also be released by reconnecting the circuit.

 TRUE FALSE

4

True or False, The natural electric field of the Earth starts at its surface and extends inward to the core.

 TRUE FALSE

5

True or False, The natural electric field of the Earth includes the electrosphere.

 TRUE FALSE

6

True or False, The natural electric field of the Earth is caused in part by the solar wind.

 TRUE FALSE

7

True or False, The natural electric field of the Earth has a negative charge at the surface of the Earth and a positive charge at the ionosphere.

 TRUE FALSE

8

Yes or No, Cosmic ray ionisation causes a layer of the atmosphere, the electrosphere, to remain highly conductive.

 Yes No

9

True or False, The natural electric field of the Earth has a gradient of the about 200 volts/meter just above the Earth's surface.

 TRUE FALSE

10

True or False, The natural electric field of the Earth has a gradient of the about 200 volts/meter just below the Earth's surface.

 TRUE FALSE

11

True or False, The natural electric field of the Earth just below the ionosphere reduces to close to a zero gradient.

 TRUE FALSE

12

True or False, An approximately 5,000 kg vehicle would need at least 3,300 Coulombs of charge (probably negative) stored onboard to be repelled by the Earth's surface.

 TRUE FALSE

13

True or False, To rise above the Earth's surface a 5,000 kg vehicle with 3,300 Coulombs aboard would have to dissipate charge.

 TRUE FALSE

14

Yes or No, A highly conducting layer at which the equipotential condition is reached is called an electrosphere.

 Yes No

15

True or False, A 5,000 kg vehicle with say 4,000 Coulombs of negative charge aboard would probably have to dissipate charge to land on the Earth's surface.

 TRUE FALSE

## Hypotheses

1. Charge can be acquire or dissipated into the atmosphere at sufficient speeds to allow landing and take-off without collisional effects of a repellor vehicle.