electromag

• What is Faraday's Law of Induction used for?

  To determine the induced emf in a coil due to changing magnetic flux
• What is the reasoning strategy for applying Lenz’s Law?

  1. Determine whether the magnetic flux is increasing or decreasing
  2. Find the direction of the induced magnetic field to oppose the flux change
  3. Use RHR-2 to determine the direction of the induced current
• In how many ways can a magnetic field generate an electric current?

  There are several ways a magnetic field can be used to generate an electric current.
• What is the current in a coil called when it is produced by a changing magnetic field?

  Induced current
• What is the SI unit of induced emf?

  Volt (V)
• What is magnetic flux?

  • The amount of magnetic field passing through a given area
• How can an emf be induced in a coil?

  By changing the area of the coil in a constant magnetic field
• What conditions must exist for both an induced emf and an induced current to be present?

  The coil must be part of a complete circuit
• What is Faraday’s Law of Electromagnetic Induction?

  • The induced emf in a coil of N loops is equal to the rate of change of magnetic flux multiplied by the number of loops
  • $E =$$-N \frac{ΔΦ}{Δt}$