Forces Between Three Point Charges (2D)
About points...
We associate a certain number of points with each exercise.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
About difficulty...
We associate a certain difficulty with each exercise.
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
Question
Solution
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Video
\(\LaTeX\)
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Don't forget to subscribe to our channel, like the videos and leave comments!
Exercise:
Three charges Q_ Q_ and Q_ are placed at the corners of an equilateral triangle. vecF_ and vecF_ are the resultant forces acting on the first two charges. Determine the resultant force acting on Q_. center includegraphicswidth.textwidth#image_path:threcharges-d# center
Solution:
The resultant force on the closed system of the three charges has to be zero i.e. vecF_+vecF_+vecF_vec It follows for vecF_: vecF_-leftvecF_+vecF_right The force on Q_ corresponds to the negative vector of the other two forces.
Three charges Q_ Q_ and Q_ are placed at the corners of an equilateral triangle. vecF_ and vecF_ are the resultant forces acting on the first two charges. Determine the resultant force acting on Q_. center includegraphicswidth.textwidth#image_path:threcharges-d# center
Solution:
The resultant force on the closed system of the three charges has to be zero i.e. vecF_+vecF_+vecF_vec It follows for vecF_: vecF_-leftvecF_+vecF_right The force on Q_ corresponds to the negative vector of the other two forces.
Meta Information
Exercise:
Three charges Q_ Q_ and Q_ are placed at the corners of an equilateral triangle. vecF_ and vecF_ are the resultant forces acting on the first two charges. Determine the resultant force acting on Q_. center includegraphicswidth.textwidth#image_path:threcharges-d# center
Solution:
The resultant force on the closed system of the three charges has to be zero i.e. vecF_+vecF_+vecF_vec It follows for vecF_: vecF_-leftvecF_+vecF_right The force on Q_ corresponds to the negative vector of the other two forces.
Three charges Q_ Q_ and Q_ are placed at the corners of an equilateral triangle. vecF_ and vecF_ are the resultant forces acting on the first two charges. Determine the resultant force acting on Q_. center includegraphicswidth.textwidth#image_path:threcharges-d# center
Solution:
The resultant force on the closed system of the three charges has to be zero i.e. vecF_+vecF_+vecF_vec It follows for vecF_: vecF_-leftvecF_+vecF_right The force on Q_ corresponds to the negative vector of the other two forces.
Contained in these collections
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Electrostatic Force by by
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Forces Between Three Point Charges by TeXercises
| Title | Matched on |
|---|---|
| Forces Between Three Point Charges (1D) | tagstitle |
| Electric Field Lines | tags |
| Brass Sphere | tags |
| Equipotentials of Two Positive Point Charges | tags |
| Stopping a Proton | tags |
Similar exercises (7)
| Title | Matched on |
|---|---|
| Forces Between Three Point Charges (1D) | tagstitle |
| Electric Field Lines | tags |
| Brass Sphere | tags |
| Equipotentials of Two Positive Point Charges | tags |
| Stopping a Proton | tags |
| Two Point Charges | tags |
| Potential in Triangle | tags |