Underrated step for logic building in programming.

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Logic building is a crucial and complex skill in programming. In essence, it is ability to come-up with solution of coding problem and write precise instructions ( or code) that a computer can execute autonomously. This skill requires aligning your thought process with computer and its capabilities. And running through code some-what abstractly to know and predict the behavior of code before it is executed. To be able to do this, one essential step that many beginner programmers overlook is performing dry runs. Understanding Dry Runs The concept of a dry run in programming is straightforward: can you mentally execute your code and predict its output without actually running it on a computer? While this seems simple, it is a challenging task. Typically, we are taught to write code, run it, and observe the output. This cycle is essential because code needs to run to be validated. However, if you rely solely on running your code to understand its behavior, you may struggle with building
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18.1.2 Electric Field Lines

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Representing Electric Fields

  • The direction of electric fields is represented by electric field lines

  • Electric field lines are directed from positive to negative

    • Therefore, the field lines must be pointed away from the positive charge and towards the negative charge

  • A radial field spreads uniformly to or from the charge in all directions

    • e.g. the field around a point charge or sphere

  • Around a point charge, the electric field lines are directly radially inwards or outwards:

    • If the charge is positive (+), the field lines are radially outwards
    • If the charge is negative (-), the field lines are radially inwards

    • This shares many similarities to radial gravitational field lines around a point mass

    • Since gravity is only an attractive force, the field lines will look similar to the negative point charge, whilst electric field lines can be in either direction

    • A uniform electric field has the same electric field strength throughout the field

      • For example, the field between oppositely charged parallel plates

    • This is represented by equally spaced field lines

      • This shares many similarities to uniform gravitational field lines on the surface of a planet

    • A non-uniform electric field has varying electric field strength throughout

    • The strength of an electric field is determined by the spacing of the field lines:

      • A stronger field is represented by the field lines closer together
      • A weaker field is represented by the field lines further apart

      • The electric field lines are directed from the positive to the negative plate

      • A radial field is considered a non-uniform field

        • So, the electric field strength E is different depending on how far you are from a charged particle

Exam Tip

Always label the arrows on the field lines! The lines must also touch the surface of the source charge or plates.

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