Electromagnets

• What does a solenoid do to the magnetic effect of a current?

  It increases the magnetic effect
• What is needed to draw the magnetic field pattern for a straight wire?

  A wire carrying a current
• What happens when the switch in the circuit is closed?

  An electric current flows around the circuit
• What does the diagram show when the current flows through a conducting wire?

  A magnetic field is produced around the wire
• How can we prove that a magnetic field exists around a wire?

  By using a compass
• What does the compass needle do when the current is turned on?

  It deflects, indicating a magnetic field
• What happens to the strength of the magnetic field as we move further from the wire?

  The strength decreases
• What occurs if we change the direction of the current?

  The direction of the magnetic field changes
• What rule do we use to determine the direction of the magnetic field produced by a wire?

  The right hand grip rule
• How do you position your right hand to apply the right hand grip rule?

  Thumb points in current direction, fingers curl
• What shape does coiling the wire create?

  A solenoid
• What type of magnetic field does a solenoid produce?

  A strong and uniform magnetic field
• How does the magnetic field around a solenoid compare to that of a bar magnet?

  It has a similar shape
• What does the right hand grip rule help determine for a solenoid?

  The direction of the magnetic field
• What are the three ways to increase the strength of the magnetic field in a solenoid?

  Increase current, turns, or add iron core
• What happens if we increase the size of the current in a solenoid?

  The strength of the magnetic field increases
• How does increasing the number of turns of the coil affect the magnetic field?

  It increases the strength of the magnetic field
• What is an iron core in a solenoid called?

  An electromagnet
• What is a key feature of electromagnets?

  We can change the strength of the magnetic field
• How can we turn an electromagnet on or off?

  By changing the size of the current
• What is the relationship between current and magnetic field strength in a wire?

  • Larger current produces a stronger magnetic field
  • Magnetic field strength decreases with distance from the wire
• What are the characteristics of the magnetic field produced by a solenoid?

  • Strong and uniform magnetic field inside
  • Similar shape to a bar magnet's field
  • Direction determined by right hand grip rule
• What are the applications of electromagnets?

  • Change strength of magnetic field
  • Turn electromagnet on or off
  • Used in various devices like motors and generators
• What is a Solenoid?


  A coil of wire that creates a strong, uniform magnetic field when an electric current flows through it