Induced EMF -

EMF gets induced in a conductor if there is relative movement between conductor and magnetic field — 2 scenarios:

  1. Magnet moves through a fixed conductor
  2. Conductor moves through a fixed magnet

Lenz’s Law -

AN INDUCED EMF ALWAYS GENERATES CURRENT OPPOSING CHANGE WHICH CREATED IT

Eg. If magnet is pushed from north end first into coil of wire, then the end of the coil closest to magnet will be north pole

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Eg. If a magnet is pulled away from the coil then the end of coil closest to the magnet becomes the south pole.

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IF MAGNET IS GOING AWAY THEN IT TRIES TO KEEP IT

IF MAGNET IS COMING THEN IT TRIES TO REPEL IT

USE THIS TO FIGURE OUT EVERYTHING

Factors Affecting Deflection -

  1. Strength of MF
  2. Speed of movement
  3. Length of wire