7.1.2 Electromagnetism

• What is electromagnetism?

  Relationship between magnetic and electric forces
• When an electric current flows through a conductor, it creates a magnetic field around the conductor.
• What factors affect the strength of electromagnets?

  Current, core material, turns
• Electromagnetism describes the relationship between magnetic and electric forces.
• Changes in magnetic fields can induce electric currents in a nearby conductor.
• What is electric current?

  Flow of electric charge
• An electric current always creates a magnetic field around a conductor.
• Steps in constructing an electromagnet

  1️⃣ Solenoid construction using copper wire

  2️⃣ Insert a soft iron core

  3️⃣ Apply electric current
• A core made of soft iron amplifies the magnetic field strength in an electromagnet.
• What are the two types of forces described in electromagnetism?

  Electric and magnetic
• Changing magnetic fields can induce electric currents.
• What is the key relationship between electricity and magnetism?

  Reciprocal
• An electric current creates a magnetic
• What happens when magnetic fields change near a conductor?

  Electric current is induced
• The relationship between electricity and magnetism is the foundation of electromagnetism.
• What three components are used to create an electromagnet?

  Solenoid, core, current
• A solenoid is typically made from copper
• A soft iron core amplifies the magnetic field of an electromagnet.
• What happens to the core when current flows through the solenoid?

  It becomes magnetized
• Match the key component with its function:

  Solenoid ↔️ Generates magnetic field when current passes through it

  Core ↔️ Amplifies the magnetic field
• What are the three main factors that affect the strength of an electromagnet?

  Turns, current, core material
• A soft iron core amplifies the magnetic field because it is easily magnetized
• What is one application of electromagnets in electric motors?

  Create rotational force
• Electromagnets are used in MRI machines to generate powerful magnetic fields for medical imaging.