Electromagnetic Induction and Electric Power Systems
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Questions and Answers

What is the unit of the magnetic field magnitude?

  • Tesla (T) (correct)
  • Volt (V)
  • Ampere (A)
  • Watt (W)

What is the direction of the induced emf dependent on?

  • The magnitude of the magnetic field
  • Whether the flux is increasing or decreasing (correct)
  • The type of surface used
  • The number of coils in the wire

What is the induced emf proportional to according to Faraday's law of induction?

  • The rate of change of magnetic flux (correct)
  • The angle between the magnetic field and the surface
  • The magnitude of the magnetic field
  • The number of coils in the wire

What is the magnetic flux through a surface proportional to?

<p>The number of field lines passing through the surface (A)</p> Signup and view all the answers

What is the purpose of an electric generator at a power plant?

<p>To supply the voltage between the terminals of the wall sockets (D)</p> Signup and view all the answers

What is the condition for there to be no induced emf?

<p>The flux is constant (D)</p> Signup and view all the answers

What phenomenon occurs when the magnetic flux through a circuit changes?

<p>Electromagnetic induction (B)</p> Signup and view all the answers

What is the purpose of moving magnets relative to coils of wire in a power-generating station?

<p>To produce a changing magnetic flux (A)</p> Signup and view all the answers

What is the central principle of electromagnetic induction?

<p>Faraday's law (A)</p> Signup and view all the answers

What is the term for the current detected in a circuit when a magnet is moved relative to a coil?

<p>Induced current (B)</p> Signup and view all the answers

Who are credited with pioneering experiments on magnetically induced emf?

<p>Michael Faraday and Joseph Henry (D)</p> Signup and view all the answers

What is the term for the emf required to cause an induced current?

<p>Induced emf (B)</p> Signup and view all the answers

What is the fundamental principle behind electromagnetic induction?

<p>A change in magnetic flux (C)</p> Signup and view all the answers

What is the direction of the induced current in a coil when a magnet is moved towards it?

<p>Opposite to the direction of the magnetic field (B)</p> Signup and view all the answers

Which of the following laws relates the induced emf to the change in magnetic flux?

<p>Faraday's law (C)</p> Signup and view all the answers

What type of current is produced when a coil is moved in a magnetic field?

<p>Alternating current (C)</p> Signup and view all the answers

Where is the magnetic field strength maximum?

<p>At the poles of the magnet (B)</p> Signup and view all the answers

What is the purpose of using a coil in electromagnetic induction experiments?

<p>To induce an emf and current (B)</p> Signup and view all the answers

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