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Difficulty: EasyFundamentals of Electromagnetism and Induction

According to the principles of electromagnetic induction, what occurs in a closed wire loop when the surrounding magnetic field changes?

  1. A
    The electrical resistance of the wire drops completely to zero.
  2. B
    A voltage is generated only while the magnetic field remains completely stationary.
  3. An electric current is induced to flow through the wire.Answer
  4. D
    The wire is permanently converted into an electrical insulator.

Answer

An electric current is induced to flow through the wire.
Electromagnetic induction occurs when a changing magnetic field cuts across a conductor, creating an electromotive force (voltage). In a closed loop, this induced voltage causes an electric current to flow.

Step-by-Step Solution

1
Identify the relationship between changing magnetic fields and conductors
A changing magnetic field cutting across a conductor generates an electromotive force (EMF).
Faraday's Law of Induction establishes that voltage is generated whenever magnetic flux lines cross a conductive path.
2
Apply the generated electromotive force to a closed circuit
The induced EMF causes electric current to circulate through the complete loop.
In any closed conductive loop, an induced potential difference creates electron flow.

Key Concept

Electromagnetic induction (generation of voltage and current via changing magnetic flux)
Estimated Time:40s
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Topics

Fundamentals of Electromagnetism and Induction

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