topic 7 - mag/electromag

• Where can the video's page be found?

  Etsy, linked in the description
• What end do magnetic field lines always leave from on a bar magnet?

  The North
• What end do magnetic field lines always enter on a bar magnet?

  The South
• Why are magnetic field lines closer together at the poles of a bar magnet?

  The field is strongest there
• What happens to the magnetic field as it gets further away from a magnet?

  It gets weaker
• What do magnets create around them?

  Invisible field lines
• What two poles do all magnets have?

  North and South
• What happens when multiple magnets interact?

  They repulse or attract
• What are four magnetic materials?

  Iron, steel, nickel, cobalt
• What happens when two of the same magnetic poles are put together?

  They will repel
• What happens when opposite magnetic poles are put together?

  They will attract
• According to the right-hand rule, what does the direction of your thumb represent?

  The direction of the current
• What is created around a wire when current flows through it?

  A magnetic field
• What shape is the magnetic field around a current-carrying wire?

  Concentric circles
• How is the strength of the magnetic field around a wire signified in an accurate diagram?

  Field lines closer together
• What is a solenoid?

  A coil of wire
• How can the magnetic field produced by a solenoid be increased?

  Wrapping it into a coil
• How can a solenoid's field be increased again?

  Using an iron core
• What happens to the magnetic field of an electromagnet when the current stops?

  The field stops
• What is an electromagnet?

  An electricity magnet
• When does the motor effect occur?

  Wire's field nears magnetic poles
• In the left-hand rule, what does a solid circle representing a wire indicate?

  Current is coming out
• In the left-hand rule, what does the middle finger represent?

  The current
• In the left-hand rule, what does the first finger represent?

  The magnetic field
• According to the left-hand rule, what indicates the direction of force?

  The thumb
• In the left-hand rule, what does a cross representing a wire indicate?

  Current is going in
• What happens when a magnetic material is brought near a permanent magnet?

  It becomes an induced magnet
• What direction do compasses point in, placed in a magnetic field?

  Parallel to field lines
• What do compasses show in a magnetic field?

  The direction of the South Pole
• What are spinning motors created using?

  DC currents and split rings
• What does the proximity of field lines indicate about the field strength?

  Closer: stronger, further: weaker
• What equation relates magnetic force, flux density, current, and length?

  $F =$$B I L$
• In the formula $F =$$B I L$, what does B stand for?


  Flux density
• In the formula $F =$$B I L$, what does I stand for?


  Current
• In the formula $F =$$B I L$, what does L stand for?


  Length
• What does this video represent in the context of GCSE physics?

  The final topic
• How does the magnetic field of a solenoid differ from that of a bar magnet?

  Field goes through the coil