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Physics Chapter 10 : Topic 6
Faraday Cage
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A Faraday cage is a device used to:
Reasoning: A Faraday cage protects its interior by preventing external electric fields from affecting the inside.
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The working principle of a Faraday cage is based on:
Reasoning: External electric fields cause charges in the conductor to rearrange, creating an opposing internal field.
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When an external electric field is applied to a conducting cage, free electrons:
Reasoning: Free electrons in a conductor move until electrostatic equilibrium is achieved.
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The induced electric field inside a Faraday cage:
Reasoning: The induced field is equal in magnitude and opposite in direction to the external field, making the net field inside zero.
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A Faraday cage works because:
Reasoning: Redistribution of charges produces an induced field that cancels the external field.
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In electrostatic equilibrium, the electric field inside a conductor is:
Reasoning: Charges rearrange themselves until the internal electric field becomes zero.
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When a charged conductor is placed in an external electric field, charges accumulate:
Reasoning: Excess charges in a conductor reside on the surface in electrostatic equilibrium.
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The electric field inside a completely enclosed Faraday cage is:
Reasoning: The induced electric field cancels the applied external electric field.
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Which material is most suitable for making a Faraday cage?
Reasoning: Metals have free electrons that can move and redistribute charges effectively.
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The main requirement for a Faraday cage to work is:
Reasoning: Conductors allow charges to move and create the shielding effect.
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A person inside a properly closed Faraday cage is protected because:
Reasoning: The induced field inside the cage cancels the external electric field.
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During electrostatic shielding, charges move until:
Reasoning: Equilibrium occurs when the induced field balances the applied field.
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Which situation demonstrates the Faraday cage effect?
Reasoning: The metal body of a car acts as a Faraday cage during lightning.
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The charge distribution on a Faraday cage in an external electric field is:
Reasoning: Free charges move to the surface of the conductor.
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If the external electric field increases, the induced charges on the Faraday cage:
Reasoning: A stronger external field requires greater induced charge separation for cancellation.
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A Faraday cage cannot completely block:
Reasoning: Shielding effectiveness depends on frequency, material, and cage design.
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The induced charges in a Faraday cage create an electric field that is:
Reasoning: The induced field opposes the external field to maintain equilibrium.
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Why holes are sometimes made very small in a Faraday cage mesh?
Reasoning: Smaller openings improve shielding effectiveness.
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The inside of a Faraday cage remains free from external electric fields because:
Reasoning: Superposition of external and induced fields results in zero net field inside.
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Which statement about a Faraday cage is correct?
Reasoning: Mobile electrons allow charge redistribution and shielding.
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If an external positive charge is brought near a metal cage, the nearer side of the cage becomes:
Reasoning: Electrons move toward the side nearest the positive charge.
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The purpose of induced charges in a Faraday cage is to:
Reasoning: Induced charges create a field opposite to the applied field.
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A closed metal box placed in an external electric field will have:
Reasoning: Charges rearrange until the internal field is cancelled.
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A Faraday cage is an example of:
Reasoning: Preventing external electric fields from reaching the inside is called electrostatic shielding.
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Which device commonly uses the Faraday cage principle?
Reasoning: The metal enclosure of a microwave prevents electromagnetic waves from escaping.
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If a conductor has a hollow cavity and no charge inside it, the electric field in the cavity is:
Reasoning: Electrostatic shielding keeps the cavity field zero.
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The Faraday cage effect is possible because conductors contain:
Reasoning: Free electrons allow rapid redistribution of charge.
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A metal airplane can protect passengers from lightning because:
Reasoning: The aircraft body acts as a Faraday cage, directing charge around the exterior.
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The net electric field inside an ideal Faraday cage is zero because:
Reasoning: The two electric fields cancel by superposition.
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Which statement best explains the operation of a Faraday cage?
Reasoning: The induced internal electric field cancels the influence of external electric fields.
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