# Electric field and electric charge inside the Earth?

• Hardik Batra
In summary, the conversation discusses the concept of charge distribution in conductors, specifically the Earth. It is mentioned that in a conducting metal, all the charge resides on the surface and there is zero electric field inside, but this is not the case with Earth. Due to the complexity of the Earth's materials and movements, the total internal charge is approximately zero but not exactly zero, making it a good conductor. This highlights the difference between idealized theoretical concepts and real life situations.
Hardik Batra
As we know, If you put charge on conductor then all the charge reside on the surface of the conductor and charge inside the conductor is zero and electric field is also zero.

Earth is also a good conductor. So the charge resides on the Earth surface?
Is there no charge inside the earth?
And Electric field is zero inside the earth?

Close to zero maybe, but not exactly zero. Earth has a magnetic field that is generated by the circulation of charges deep inside the liquid molten core. The existence of that magnetic field tells us that the charges must be nonzero.

anorlunda said:
Close to zero maybe, but not exactly zero.
So there is contradiction between metal conductor and Earth conductor.
Because it is zero in metal but not in Earth but both are good conductor.

And the property of the conductor says that charge always resides on the surface of the conductor but it is not happen in case of earth.
Then how to understand this.

It is not a contradiction. It is a question of complexity. A conducting metal sphere (including Earth) has zero internal fields. However the Earth has many internal materials, some conducting , some not. The materials move. Some have piezoelectric properties.

The total internal charge of a local region inside the Earth is thus approximately zero but not exactly zero. You could also say that most .ocal regions are approximately conductors.

Whenever you mix up idealized theoretical concepts with real life, you risk confusing yourself with apparent contradictions that are not real. Few things in real life are ideal or pure.

Hardik Batra

## 1. What is the source of the electric field inside the Earth?

The source of the electric field inside the Earth is primarily due to the movement of charged particles (ions and electrons) in the Earth's molten core.

## 2. How does the electric field inside the Earth affect its surface?

The electric field inside the Earth can induce small electrical currents in the Earth's surface, which can have an impact on geological processes such as earthquakes and volcanism. It can also affect the Earth's magnetic field.

## 3. Is the electric field inside the Earth uniform?

No, the electric field inside the Earth is not uniform. It varies in strength and direction depending on factors such as the Earth's rotation, the composition of the core, and the presence of other electrically conductive materials in the Earth's interior.

## 4. How is the electric field inside the Earth measured?

The electric field inside the Earth is typically measured using instruments called magnetometers, which can detect changes in the Earth's magnetic field caused by the electric currents in the core. Other methods include studying the behavior of seismic waves and analyzing data from satellites orbiting the Earth.

## 5. Can the electric field inside the Earth be manipulated or controlled?

Currently, we do not have the technology to manipulate or control the electric field inside the Earth. However, some scientists are researching ways to artificially induce electric currents in the Earth's core for potential energy production or to protect the Earth from solar storms.

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