13.1 Inducing Voltage

• Moving a conductor in a magnetic field changes the magnetic flux
• In Faraday's Law, the induced voltage is represented by the symbol $\varepsilon$
• A faster changing magnetic field will induce a higher voltage
• The number of turns in the coil is directly proportional to the induced voltage.


  True
• Match the type of electromagnetic induction with its description:

  Self-induction ↔️ Induced voltage in the same coil

  Mutual induction ↔️ Induced voltage in a nearby coil
• Which type of electromagnetic induction requires another coil nearby?

  Mutual induction
• What happens to the magnetic flux linkage when the magnetic field strength around a conductor is altered?

  It changes
• Electromagnetic induction occurs when a voltage is produced in a conductor exposed to a changing magnetic field
• The negative sign in Faraday's Law indicates that the induced voltage opposes the change in magnetic flux
• Match the type of electromagnetic induction with its description:

  Self-induction ↔️ Voltage induced in the same coil

  Mutual induction ↔️ Voltage induced in a nearby coil
• Eddy current brakes use induced voltage to create a braking force.


  True
• What is electromagnetic induction?

  Voltage induced by magnetic field
• What does Faraday's Law state?

  Induced voltage is proportional to rate of change of magnetic flux
• Which two factors affect the induced voltage in Faraday's Law?

  Rate of change of magnetic flux and number of turns in the coil
• What is the mathematical expression for Faraday's Law?

  $\varepsilon =$$- N\frac{d\Phi}{dt}$
• What two factors does the induced voltage depend on according to Faraday's Law?

  Number of turns and rate of change of magnetic flux
• Mutual induction requires two coils in close proximity.


  True
• How does moving a magnet near a conductor induce a voltage?

  By changing the magnetic field
• Match the variables in Faraday's Law with their meanings:

  \varepsilon</latex> ↔️ Induced voltage

  N ↔️ Number of turns

  $\frac{d\Phi}{dt}$ ↔️ Rate of change of flux
• More turns in a coil result in a higher induced voltage.


  True
• Transformers use mutual induction to step up or step down voltage
• The induced voltage in a coil is directly proportional to the rate of change of magnetic flux.


  True
• Moving a magnet near a conductor induces a voltage because the magnetic field changes.


  True
• The negative sign in Faraday's Law indicates that the induced voltage opposes the change in magnetic flux.


  True
• Steps to induce a voltage by moving a conductor in a magnetic field

  1️⃣ Move the conductor within the magnetic field

  2️⃣ The magnetic flux linking the conductor changes

  3️⃣ A voltage is induced in the conductor
• The opposition of induced voltage to changes in magnetic flux is described by Lenz's Law.
• Self-induction occurs within the same coil
• Moving a conductor in a magnetic field changes the magnetic flux
• Increasing the number of turns in a coil increases the induced voltage.


  True
• Faraday's Law states that the induced voltage is proportional to the rate of change of magnetic flux.

  True
• What effect does a faster changing magnetic field have on the induced voltage?

  Increases the voltage
• In what type of electrical device is induced voltage used to generate electricity?

  Generators
• Arrange the following factors affecting induced voltage in order of their effect, from most to least significant:

  1️⃣ Rate of change of magnetic flux

  2️⃣ Number of turns in the coil