# Electrostatic shielding in a cavity

• @bhishek
In summary, when a constant electric field exists in space and an open lid cube type conductor is brought inside, the electric field in the question marked area would be zero. This is because electric fields cancel out inside of a conductor. The same principle applies to an open lid conductor. However, in the case of a hollow semi-sphere and a small sphere connected to it, there may be non-negligible perpendicular fields between the end of the semi-sphere and the center. While regular Faraday cages are used for shielding, the effectiveness of the last device described is unknown as it was just made up.

#### @bhishek

Suppose a constant electric field exists in space as shown in the file and a open lid cube type conductor is brought inside the field. What would be the electric field in the question marked area. Would it be zero or equal to original electric field.

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• electrostatic sheilding.docx
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Lid being open would slightly matter if it faced the electric field vectors, that the charge would accumulate on the tips and cause a curved electric field. The net electric field would still approach to zero as you got closer to the bottom. But in this case, it is definitely zero.

If that is the case than two conductors of any shape having an electrical path between them will have nil electric field between them when placed inside an electric field. Can we stretch the logic that far??

Not that far. Think of a hollow semi-sphere and a small sphere on its center, connected to it. When you apply an electric field in center to semi-sphere direction, there will be perpendicular fields between the end of the semi-sphere and the center, non-negligible.

@bhishek
TESL@ said:
Not that far. Think of a hollow semi-sphere and a small sphere on its center, connected to it. When you apply an electric field in center to semi-sphere direction, there will be perpendicular fields between the end of the semi-sphere and the center, non-negligible.
Thank you,for explaining.
Is this type of shielding used anywhere?

The regular Faraday cage is used but I don't know about the last device, I just made it up.

@bhishek
TESL@ said:
The regular Faraday cage is used but I don't know about the last device, I just made it up.
Thanks once again.

## 1. What is electrostatic shielding in a cavity?

Electrostatic shielding in a cavity refers to the process of reducing or eliminating the effects of an electrostatic field within an enclosed space or cavity. This is commonly achieved by using conductive materials to create a barrier that redirects the electric field lines away from the interior of the cavity.

## 2. How does electrostatic shielding work?

Electrostatic shielding works by creating a conductive barrier around the cavity, which allows the electric field lines to flow around the cavity rather than penetrate it. This is similar to how a Faraday cage works, where the conductive material absorbs the electric field and redirects it, preventing it from reaching the interior of the cavity.

## 3. What are some common applications of electrostatic shielding in a cavity?

Electrostatic shielding in a cavity is commonly used in electronic devices, such as computers and smartphones, to protect sensitive components from outside sources of electrostatic interference. It is also used in scientific experiments and equipment to prevent external electric fields from affecting sensitive measurements.

## 4. What materials are commonly used for electrostatic shielding in a cavity?

Conductive metals, such as copper, aluminum, and silver, are commonly used for electrostatic shielding in a cavity. These materials have a high electrical conductivity, allowing them to effectively redirect electric fields. Additionally, conductive paints and coatings can also be used for electrostatic shielding.

## 5. Are there any limitations to electrostatic shielding in a cavity?

While electrostatic shielding is effective in reducing or eliminating the effects of external electric fields, it may not completely eliminate all electric fields within the cavity. This is because electric fields can still penetrate through small gaps or imperfections in the conductive barrier. Additionally, electrostatic shielding is not effective against magnetic fields.