7.1.2 Electromagnetism

• Electromagnetism is similar to permanent magnetism as both involve magnetic fields
• How can the strength of an electromagnet be adjusted?

  By controlling electric current
• Steps to use Fleming's left-hand rule

  1️⃣ Thumb points in the direction of the force

  2️⃣ Index finger points in the direction of the magnetic field

  3️⃣ Middle finger points in the direction of the current
• What is the relationship between electric current and magnetic field strength in electromagnetism?

  Directly proportional
• Electromagnetism is the phenomenon where electric currents generate magnetic fields
• Electromagnets have constant magnetic fields, similar to permanent magnets.

  False
• The direction of the force on a current-carrying conductor in a magnetic field is determined using Fleming's left-hand rule
• What type of energy conversion occurs in electromagnetic induction?

  Mechanical to electrical
• What are two primary devices that rely on electromagnetism?

  Motors and generators
• What induces an electric current in a generator?

  Changing magnetic flux
• What is electromagnetism?

  Relationship between electricity and magnetism
• The strength of the magnetic field in electromagnetism is directly proportional to the electric current


  True
• Unlike permanent magnets, electromagnets can be turned on and off

  True
• What does Lenz's law state?

  Induced current opposes change
• Electromagnets, unlike permanent magnets, can be turned on and off.


  True
• What is the effect of increasing electric current on the magnetic field strength in electromagnetism?

  Increases
• When is the force on a current-carrying conductor in a magnetic field greatest?

  Perpendicular to field
• Match the concept with its description:

  Electromagnetic Induction ↔️ Changing magnetic field induces emf

  Lenz's Law ↔️ Opposes the change that caused it

  Magnetic Flux ↔️ Rate of change is related to emf
• Lenz's law ensures energy conservation in electromagnetic induction.


  True
• Electric motors convert electrical energy into mechanical motion
• Match the device with its energy conversion:

  Electric Motor ↔️ Electrical to kinetic

  Generator ↔️ Kinetic to electrical
• Motors and generators use the same electromagnetic principles but serve different purposes.


  True