6.3.2 Electromagnetic Induction

• Faraday's law states that the induced EMF in a conductor is proportional to the rate of change of magnetic flux.

  True
• Lenz's law states that the induced current creates a magnetic field that opposes the original change in magnetic field
• When a magnet is pushed into a coil, the induced current creates a magnetic field that opposes the motion
• What are the factors that determine the induced electromotive force (EMF) in a conductor according to Faraday's law?

  Magnetic flux, rate of change, number of turns
• How does the rate of change of magnetic flux affect the induced EMF?

  Directly proportional
• Faraday's law of electromagnetic induction states that the induced EMF is proportional to the rate of change of magnetic flux.


  True
• What are the factors affecting the induced electromotive force (EMF) in a conductor?

  Magnetic flux, rate of change, number of turns
• A 300-turn coil has its magnetic flux change from 0.1 Wb to 0.4 Wb in 3 seconds. The induced EMF is -30 V.
• What does 'N' represent in Faraday's law?

  Number of turns in the coil
• What is the process of generating an electric current in a conductor by changing the magnetic field around it called?

  Electromagnetic induction
• What is the mathematical expression for Faraday's law of electromagnetic induction?

  $\varepsilon =$$- \frac{d\Phi}{dt}$
• When a magnet is pushed into a coil, the induced current opposes the motion of the magnet.


  True
• A higher magnetic flux leads to a higher induced EMF
• Electromagnetic induction is the process of generating an electric current in a conductor by changing the magnetic field around it.
• What does the negative sign in Faraday's law indicate about the direction of the induced EMF?

  It opposes the change
• The mathematical expression for Faraday's law of electromagnetic induction is $\varepsilon =$$- N \frac{d\Phi}{dt}$
• Faraday's law states that the induced EMF is proportional to the rate of change of magnetic flux
• The rate of change of magnetic flux is measured in webers per second
• Mutual induction occurs when a change in magnetic flux through one coil induces an EMF in a nearby coil
• What does Lenz's law state about the direction of induced current?

  It opposes the change
• When you move a magnet through a coil of wire, it induces an electric current
• Match the variables in Faraday's law with their definitions:

  $\varepsilon$ ↔️ Induced EMF

  $\Phi$ ↔️ Magnetic flux

  $\frac{d\Phi}{dt}$ ↔️ Rate of change of magnetic flux
• What does Lenz's law state about the direction of induced current?

  It opposes the change
• Lenz's law implies that the induced current will create a magnetic field that enhances the original change in magnetic flux.

  False
• Match the term with its variable in Faraday's law:

  Induced EMF ↔️ $\varepsilon$

  Number of turns in the coil ↔️ $N$

  Rate of change of magnetic flux ↔️ $\frac{d\Phi}{dt}$
• What induces an electromotive force (EMF) in a conductor during electromagnetic induction?

  Changing magnetic field
• Order the steps involved in Lenz's law when a magnet is moved through a coil:

  1️⃣ Magnet is moved through a coil

  2️⃣ Magnetic flux changes

  3️⃣ Induced current is generated

  4️⃣ Magnetic field opposes motion
• How do you calculate the induced EMF using Faraday's law if the magnetic flux changes from 0.05 Wb to 0.25 Wb in 2 seconds in a coil with 500 turns?

  -50 V
• The induced EMF is measured in volts (V)


  True
• A coil with 500 turns experiencing a change in magnetic flux from 0.05 Wb to 0.25 Wb in 2 seconds results in an induced EMF of -50 V


  True
• Both self-induction and mutual induction are described by Faraday's law

  True
• A higher number of turns in a coil leads to a higher induced EMF


  True
• What is the induced EMF in a 300-turn coil when the magnetic flux changes from 0.1 Wb to 0.4 Wb in 3 seconds?

  -30 V
• Steps involved in generating an electric current through electromagnetic induction:

  1️⃣ Change the magnetic field around a conductor

  2️⃣ Conductor moves through a magnetic field

  3️⃣ Current is generated in the conductor
• Mutual induction involves the interaction between two or more conductors