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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18.1.3 Electric Field Strength

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Electric Field Strength

  • The electric field strength of a uniform field between two charged parallel plates is defined as:
E = ΔV /Δd
  • Where:
    • E = electric field strength (V m-1)
    • ΔV = potential difference between the plates (V)
    • Δd = separation between the plates (m)
  • Note: the electric field strength is now also defined by the units V m1
  • The equation shows:
    • The greater the voltage between the plates, the stronger the field
    • The greater the separation between the plates, the weaker the field
  • Remember this equation cannot be used to find the electric field strength around a point charge (since this would be a radial field)
  • The direction of the electric field is from the plate connected to the positive terminal of the cell to the plate connected to the negative terminal


The E field strength between two charged parallel plates is the ratio of the potential difference and separation of the plates

  • Note: if one of the parallel plates is earthed, it has a voltage of 0 V

Electric Field of a Point Charge

  • The electric field strength at a point describes how strong or weak an electric field is at that point
  • The electric field strength E at a distance r due to a point charge Q in free space is defined by:

E = Q/ 4πε0r^2

  • Where:
    • Q = the charge producing the electric field (C)
    • r = distance from the centre of the charge (m)
    • ε0 = permittivity of free space (F m-1)
  • This equation shows:
    • Electric field strength is not constant
    • As the distance from the charge r increases, E decreases by a factor of 1/r^2
  • This is an inverse square law relationship with distance
  • This means the field strength decreases by a factor of four when the distance is doubled
  • Note: this equation is only for the field strength around a point charge since it produces a radial field
  • The electric field strength is a vector Its direction is the same as the electric field lines
    • If the charge is negative, the E field strength is negative and points towards the centre of the charge
    • If the charge is positive, the E field strength is positive and points away from the centre of the charge
  • This equation is analogous to the gravitational field strength around a point mass

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