Class 12PhysicsElectrostatic Potential and CapacitanceConductor, Electrostatic Shielding, Induced Charge and Charge Redistribution on conductor
MediumExplain electrostatic shielding with a necessary diagram.
(N/A) Electrostatic shielding is the phenomenon of protecting a certain region of space from an external electric field by surrounding it with a conductor.
Consider a conductor with a cavity as shown in the figure. Regardless of the size and shape of the cavity,if there are no charges inside it,the electric field inside the cavity remains zero.
When a conductor with a cavity is placed in an external electric field,the charges redistribute themselves on the outer surface such that the electric field inside the material of the conductor and within the cavity becomes zero.
Even if the conductor is charged,all excess charges reside only on the outer surface of the conductor. Thus,any cavity in a conductor remains shielded from external electric influences. This is known as electrostatic shielding.
$A$ practical example is sitting inside a car during a thunderstorm. If lightning strikes the car,the metal body of the car acts as an electrostatic shield,ensuring that the electric field inside remains zero,thus keeping the occupants safe.
Consider a conductor with a cavity as shown in the figure. Regardless of the size and shape of the cavity,if there are no charges inside it,the electric field inside the cavity remains zero.
When a conductor with a cavity is placed in an external electric field,the charges redistribute themselves on the outer surface such that the electric field inside the material of the conductor and within the cavity becomes zero.
Even if the conductor is charged,all excess charges reside only on the outer surface of the conductor. Thus,any cavity in a conductor remains shielded from external electric influences. This is known as electrostatic shielding.
$A$ practical example is sitting inside a car during a thunderstorm. If lightning strikes the car,the metal body of the car acts as an electrostatic shield,ensuring that the electric field inside remains zero,thus keeping the occupants safe.
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Similar Questions
Two thin conducting concentric shells of radii $R$ and $2R$ are shown in the figure. The outer shell carries a charge $+Q$ and the inner shell is neutral. When the switch $K$ is closed,which of the following statement$(s)$ is/are correct?
$(a)$ The potential on the inner shell becomes zero.
$(b)$ The charge on the inner shell is $\frac{Q}{2}$.
$(a)$ The potential on the inner shell becomes zero.
$(b)$ The charge on the inner shell is $\frac{Q}{2}$.
DifficultAP EAMCET 2023
View Solution$A$ point charge of magnitude $+ 1\,\mu C$ is fixed at $(0, 0, 0)$. An isolated uncharged spherical conductor is fixed with its center at $(4, 0, 0)$. The potential and the induced electric field at the center of the sphere are:
DifficultJEE MAIN 2013
View SolutionAssertion: $A$ metallic shield in the form of a hollow shell may be built to block an electric field.
Reason: In a hollow spherical shield,the electric field inside it is zero at every point.
Reason: In a hollow spherical shield,the electric field inside it is zero at every point.
Assertion: $A$ positive charge particle is placed in front of a spherical uncharged conductor. The number of lines of force terminating on the sphere will be more than those emerging from it.
Reason: The surface charge density at a point on the sphere nearest to the point charge will be negative and maximum in magnitude compared to other points on the sphere.
Reason: The surface charge density at a point on the sphere nearest to the point charge will be negative and maximum in magnitude compared to other points on the sphere.
Explain the construction of a Van de Graaff generator with a diagram and describe its uses.
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