Class 12PhysicsElectric Potential and CapacitanceConductor, Electrostatic Shielding, Induced Charge and Charge Redistribution on conductor
Medium"The electric field inside the hollow region of a conductor in a uniform electric field is zero". Explain.
(N/A) Consider a conductor with a cavity as shown in the figure.
There are no charges inside the cavity.
Regardless of the size and shape of the cavity, if a conductor with a cavity is placed in an external electric field, the electric field inside the cavity remains 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 the conductor.
Any cavity in a conductor remains shielded from external electric influence. This phenomenon is known as electrostatic shielding.
For example, when we are in a car during a thunderstorm with lightning, we should close all the doors of the car. If lightning strikes the car (or a live current-carrying wire falls on the car), electrostatic shielding develops on the outer surface of the car, and we remain safe inside.
There are no charges inside the cavity.
Regardless of the size and shape of the cavity, if a conductor with a cavity is placed in an external electric field, the electric field inside the cavity remains 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 the conductor.
Any cavity in a conductor remains shielded from external electric influence. This phenomenon is known as electrostatic shielding.
For example, when we are in a car during a thunderstorm with lightning, we should close all the doors of the car. If lightning strikes the car (or a live current-carrying wire falls on the car), electrostatic shielding develops on the outer surface of the car, and we remain safe inside.
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Similar Questions
Two identical conductors of copper and aluminium are placed in identical electric fields. The magnitude of induced charge in the aluminium will be
$A$ spherical metal shell $A$ of radius $R_A$ and a solid metal sphere $B$ of radius $R_B < R_A$ are kept far apart and each is given charge $+Q$. Now they are connected by a thin metal wire. Then:
$(A)$ $E_A^{\text{inside}} = 0$
$(B)$ $Q_A > Q_B$
$(C)$ $\frac{\sigma_A}{\sigma_B} = \frac{R_B}{R_A}$
$(D)$ $E_A^{\text{on surface}} < E_B^{\text{on surface}}$
$(A)$ $E_A^{\text{inside}} = 0$
$(B)$ $Q_A > Q_B$
$(C)$ $\frac{\sigma_A}{\sigma_B} = \frac{R_B}{R_A}$
$(D)$ $E_A^{\text{on surface}} < E_B^{\text{on surface}}$
DifficultIIT 2011
View Solution$A$ hollow conducting sphere is placed in an electric field produced by a point charge placed at $P$ as shown in the figure. Let $V_A, V_B$,and $V_C$ be the potentials at points $A, B$,and $C$ respectively,where $A$ and $B$ are on the surface of the sphere and $C$ is inside the sphere. Then:
Medium
View SolutionTwo spheres $A$ and $B$ are kept very near to each other. $A$ is negatively charged and $B$ is earthed. The true statement is:
$(A)$ Charge on $B$ is zero
$(B)$ Potential at $B$ is zero
$(C)$ Charge is uniformly distributed on $A$
$(D)$ Charge is non-uniformly distributed on $A$
$(A)$ Charge on $B$ is zero
$(B)$ Potential at $B$ is zero
$(C)$ Charge is uniformly distributed on $A$
$(D)$ Charge is non-uniformly distributed on $A$
Medium
View Solution‘The interior of a conductor can have no excess charge in the static situation’. Explain.
Medium
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