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A-Level物理——电场与电场力凡例要点

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  为匹配父亲家更好的复课A-Level试场,新正西方刘欣梦教养员为父亲家说皓A-Level物理试场电场与电场力Electric Fields and Forces revision复课要点。期望却以对父亲家的A-Level试场拥有所僚佐。

  Part 1 Electric Field Shapes 电场概念及体即兴

  Electric Field

  “An electric field is a region in which particles with charge experience a force”

  Field Shape Diagrams

  We represent electric fields with diagrams that have conventions (or rules) that need to be followed.

  For example:

  The field lines (and arrows) show the direction of the force that would be felt by a positive charge at that point in the field. Note that unlike gravitational fields, electric fields can attract or repel objects.

  The spacing between the lines shows how strong the field is at that point. In this case it's strongest near to the charge because the lines are closest there.

  This field is uniform because the spacing between the lines remains the same throughout the field shown. The field lines are parallel and equispaced.

  Part 2 Electric field strength 电场强大度

  This is defined as the force per unit charge acting at a point in the field. So an equation for it is:

  

  Where:.

  E=electric field strength

  F=force acting in newtons

  q=the charge in coulombs

  Units of E: NC-1 or Vm-1 (these are the same thing!!)

  (1)匀强大电场Uniform Fields

  There is one special example you also need to know :

  

  This is a uniform field. The field strength at any point in this field is:

  

  where

  V=the pd between the plates

  d=the distance separating the plates.

  Field strength is a vector - it has direction as well as magnitude.

  This is important to remember because in electric fields you can have field strengths acting in different directions due to different signs of charge.

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