Simple Double Capacitor
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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Exercise:
A double capacitor consists of two fixed outer plates and two connected inner plates. The inner plates can be moved from left to right see figure which causes a change to the distances a and b between the two parallel plate capacitors C_ and C_. Show that the capacitance of the two capacitors in series does not dep on the position of the inner plates. center includegraphicswidth.textwidth#image_path:basic-doublcapacitor# center
Solution:
The two capacitors are C_ varepsilon_ fracAa C_ varepsilon_ fracAb The da+b of the two distances is constant. We can therefore write a x d b -x d with xin. The series capacitance is given by sscCs leftfracC_+fracC_right^- leftfracx dvarepsilon_ A+frac-x dvarepsilon_ Aright^- varepsilon_fracAdleftx+-xright^- varepsilon_fracAd It turns out that the capacitance is indepent of the position of the inner plates and corresponds to a parallel plate capacitor with the same plate area and a distance equal to the of the two distances a and b.
A double capacitor consists of two fixed outer plates and two connected inner plates. The inner plates can be moved from left to right see figure which causes a change to the distances a and b between the two parallel plate capacitors C_ and C_. Show that the capacitance of the two capacitors in series does not dep on the position of the inner plates. center includegraphicswidth.textwidth#image_path:basic-doublcapacitor# center
Solution:
The two capacitors are C_ varepsilon_ fracAa C_ varepsilon_ fracAb The da+b of the two distances is constant. We can therefore write a x d b -x d with xin. The series capacitance is given by sscCs leftfracC_+fracC_right^- leftfracx dvarepsilon_ A+frac-x dvarepsilon_ Aright^- varepsilon_fracAdleftx+-xright^- varepsilon_fracAd It turns out that the capacitance is indepent of the position of the inner plates and corresponds to a parallel plate capacitor with the same plate area and a distance equal to the of the two distances a and b.
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Exercise:
A double capacitor consists of two fixed outer plates and two connected inner plates. The inner plates can be moved from left to right see figure which causes a change to the distances a and b between the two parallel plate capacitors C_ and C_. Show that the capacitance of the two capacitors in series does not dep on the position of the inner plates. center includegraphicswidth.textwidth#image_path:basic-doublcapacitor# center
Solution:
The two capacitors are C_ varepsilon_ fracAa C_ varepsilon_ fracAb The da+b of the two distances is constant. We can therefore write a x d b -x d with xin. The series capacitance is given by sscCs leftfracC_+fracC_right^- leftfracx dvarepsilon_ A+frac-x dvarepsilon_ Aright^- varepsilon_fracAdleftx+-xright^- varepsilon_fracAd It turns out that the capacitance is indepent of the position of the inner plates and corresponds to a parallel plate capacitor with the same plate area and a distance equal to the of the two distances a and b.
A double capacitor consists of two fixed outer plates and two connected inner plates. The inner plates can be moved from left to right see figure which causes a change to the distances a and b between the two parallel plate capacitors C_ and C_. Show that the capacitance of the two capacitors in series does not dep on the position of the inner plates. center includegraphicswidth.textwidth#image_path:basic-doublcapacitor# center
Solution:
The two capacitors are C_ varepsilon_ fracAa C_ varepsilon_ fracAb The da+b of the two distances is constant. We can therefore write a x d b -x d with xin. The series capacitance is given by sscCs leftfracC_+fracC_right^- leftfracx dvarepsilon_ A+frac-x dvarepsilon_ Aright^- varepsilon_fracAdleftx+-xright^- varepsilon_fracAd It turns out that the capacitance is indepent of the position of the inner plates and corresponds to a parallel plate capacitor with the same plate area and a distance equal to the of the two distances a and b.
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