Bar magnet pushed into coil

• The induced EMF (and current) can be increased by:

  • moving the magnet faster
  • using a stronger magnet
  • increasing the number of turns in the coil

  
• If the magnet is pulled away, the direction of the induced EMF (and current) is reversed

  
• Using South pole instead of North pole reverses direction of induced EMF (and current)

  
• If the magnet is held still, there is no EMF

  
• An induced current always flows in a direction such that it opposes the change which produced it.
• When a magnet is moved towards a coil the pole of the coil and magnet next to each other are the same.
• The pole-type (north or south) is controlled by the direction in which the current is induced.
• The direction of the current is given by theright-hand grip rule

  
• The fingers point in the conventional current direction and the thumb gives the North Pole.