magnetism and electromagnetism:

• for a current carrying wire, how could you change the direction of the magnetic field

  change the direction of the current ( or voltage )
• is iron magnetically soft or hard

  iron is magnetically soft, it gains and loses its magnetism slowly
• is the magnet force between an induced magnet and the permanent magnetic that created it attractive or repulsive

  it will always be attractive
• how can you use iron fillings to visualise field lines

  place the magnet under a piece of card; sprinkle fillings over the piece of card; tap the piece of card- this will cause the iron fillings to accumulate along the field lines
• what is a solenoid

  a solenoid is a coil of wire, with a strong uniform magnet field inside it
• for a current carrying wire, how could use increase the strength of the magnetic field

  increase the current ( voltage )