Explain electrostatic shielding with necessary diagram.
Explain electrostatic shielding with necessary diagram.
Consider a conductor with a cavity as shown in figure.
There is no charges inside the cavity.
Whatever be the size and shape of the cavity.
If a conductor with cavity placed in external electric field, its electric field in cavity remain zero.
If the conductor is charged or charges are induced on a neutral conductor by an external field, all charges reside only on the outer surface of a conductor with cavity.
Any cavity in a conductor remains shielded from outside electric influence. This is known as electrostatic shielding.
When we are in the car and there is thunder with lighting in the sky, we should closed all doors of the car. If lighting strikes the car, (or live current wire falls on car) electrostatic shielding develops on the outer surface of the car and we are safe inside the car.
Similar Questions
An empty thick conducting shell of inner radius $a$ and outer radius $b$ is shown in figure.If it is observed that the inner face of the shell carries a uniform charge density $-\sigma$ and the surface carries a uniform charge density $ '\sigma '$
If another point charge $q_B$ is also placed at a distance $c ( > b) $ the center of shell, then choose the correct statements
An empty thick conducting shell of inner radius $a$ and outer radius $b$ is shown in figure.If it is observed that the inner face of the shell carries a uniform charge density $-\sigma$ and the surface carries a uniform charge density $ '\sigma '$
If another point charge $q_B$ is also placed at a distance $c ( > b) $ the center of shell, then choose the correct statements
If electric potential of the inner sphere is $10\, volt$ and that of the outer shell is $50\, volt$ then potential at common centre is :-......$V$
If electric potential of the inner sphere is $10\, volt$ and that of the outer shell is $50\, volt$ then potential at common centre is :-......$V$
Two thin conducting shells of radii $R$ and $3R$ are shown in the figure. The outer shell carries a charge $+ Q$ and the inner shell is neutral. The inner shell is earthed with the help of a switch $S$.
Two thin conducting shells of radii $R$ and $3R$ are shown in the figure. The outer shell carries a charge $+ Q$ and the inner shell is neutral. The inner shell is earthed with the help of a switch $S$.
A metallic rod is placed in a uniform electric field. Select the correct option.
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Electric potential of earth is taken to be zero because earth is a good
Electric potential of earth is taken to be zero because earth is a good
- [AIIMS 1998]