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Physics · Electrostatic Potential

हिन्दी

A conductor has an internal cavity with no charges placed inside it. When the conductor is placed in a strong external electric field, the electric field inside the cavity is:

  1. Zero everywhere inside the cavity
  2. Uniform and equal to the external field
  3. Dependent on the shape and size of the cavity
  4. Proportional to the net charge on the conductor

Correct answer · Option 1

Zero everywhere inside the cavity

Explanation

By electrostatic shielding, the electric field inside an empty cavity within a conductor is identically zero, irrespective of external field or shape.

Related questions

A capacitor of capacitance \( C_1 = 4\, \mu\text{F} \) is charged to \( 50\text{ V} \) and another capacitor \( C_2 = 6\, \mu\text{F} \) is charged to \( 100\text{ V} \). If they are connected together in parallel with plates of like polarity connected together, the final common potential difference across the combination is:→Inside a uniformly polarised dielectric slab, the net charge in any macroscopic volume element \( \Delta v \) is zero because:→A conductor and a dielectric slab are placed separately in a uniform external electric field \( \mathbf{E}_0 \). If \( \mathbf{E}_{\text{in}} \) represents the induced electric field inside each material, the net electric field inside them satisfies:→Given below are two statements: Statement I: The formula for electrostatic energy density \( u = \frac{1}{2} \varepsilon_0 E^2 \) is valid only for the uniform electric field between the plates of a parallel plate capacitor. Statement II: The permittivity of a dielectric medium is always smaller than the permittivity of free space. In the light of the above statements, choose the most appropriate answer from the options given below:→
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