Magnetisches Feld einer Glühbirne
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
Short
Video
\(\LaTeX\)
Need help? Yes, please!
The following quantities appear in the problem:
Magnetische Flussdichte \(B\) / Leistung \(P, \Phi\) / Fläche \(A\) / Elektrisches Feld \(\vec E\) / Schallintensität \(I\) / Radius \(r\) / Oberfläche \(S\) / Strahlungsintensität \(I\) /
The following formulas must be used to solve the exercise:
\(E_0 = c \cdot B_0 \quad \) \(S = 4 \pi r^2 \quad \) \(J = \frac{P}{A} \quad \) \(I = wc = \frac12 \frac{EB}{\mu_0} \quad \)
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Don't forget to subscribe to our channel, like the videos and leave comments!
Exercise:
Eine Pg-Glühbirne strahle rund etO ihrer Energie als elektromagnetische Wellen ab; es wird hier angenommen dass sie das kugelförmig in alle Raumrichtungen gleichmässig tut. Wie gross sind elektrisches und magnetisches Feld dieser Strahlung in rO Abstand zur Glühbirne?
Solution:
Im angegebenen Abstand ist die als elektromagnetische Welle abgestrahlte Leistung der Glühbirne also P eta P' et Pg P auf S A pi r^ pi qtyr^ A Kugeloberfläche verteilt. Dort misst man also I fracP_epi r^ fraceta Ppi r^ fracPpi qtyr^ I Strahlungsensität. Daraus lassen sich die Effektivwerte der beiden Felder berechnen: E B
Eine Pg-Glühbirne strahle rund etO ihrer Energie als elektromagnetische Wellen ab; es wird hier angenommen dass sie das kugelförmig in alle Raumrichtungen gleichmässig tut. Wie gross sind elektrisches und magnetisches Feld dieser Strahlung in rO Abstand zur Glühbirne?
Solution:
Im angegebenen Abstand ist die als elektromagnetische Welle abgestrahlte Leistung der Glühbirne also P eta P' et Pg P auf S A pi r^ pi qtyr^ A Kugeloberfläche verteilt. Dort misst man also I fracP_epi r^ fraceta Ppi r^ fracPpi qtyr^ I Strahlungsensität. Daraus lassen sich die Effektivwerte der beiden Felder berechnen: E B
Meta Information
Exercise:
Eine Pg-Glühbirne strahle rund etO ihrer Energie als elektromagnetische Wellen ab; es wird hier angenommen dass sie das kugelförmig in alle Raumrichtungen gleichmässig tut. Wie gross sind elektrisches und magnetisches Feld dieser Strahlung in rO Abstand zur Glühbirne?
Solution:
Im angegebenen Abstand ist die als elektromagnetische Welle abgestrahlte Leistung der Glühbirne also P eta P' et Pg P auf S A pi r^ pi qtyr^ A Kugeloberfläche verteilt. Dort misst man also I fracP_epi r^ fraceta Ppi r^ fracPpi qtyr^ I Strahlungsensität. Daraus lassen sich die Effektivwerte der beiden Felder berechnen: E B
Eine Pg-Glühbirne strahle rund etO ihrer Energie als elektromagnetische Wellen ab; es wird hier angenommen dass sie das kugelförmig in alle Raumrichtungen gleichmässig tut. Wie gross sind elektrisches und magnetisches Feld dieser Strahlung in rO Abstand zur Glühbirne?
Solution:
Im angegebenen Abstand ist die als elektromagnetische Welle abgestrahlte Leistung der Glühbirne also P eta P' et Pg P auf S A pi r^ pi qtyr^ A Kugeloberfläche verteilt. Dort misst man also I fracP_epi r^ fraceta Ppi r^ fracPpi qtyr^ I Strahlungsensität. Daraus lassen sich die Effektivwerte der beiden Felder berechnen: E B
Contained in these collections
-
EM Felder in Abstand zur Quelle by TeXercises
| Title | Matched on |
|---|---|
| Strahlungsdruck einer Glühbirne | tagsformula |
| Kraft einer elektromagnetischen Welle auf Blech | formula |
| EM-Felder von AM-Radiostation | formula |
| Strahlungsdruck von Welle | formula |
| Lichtmühle | formula |
Similar exercises (11)
| Title | Matched on |
|---|---|
| Strahlungsdruck einer Glühbirne | tagsformula |
| Kraft einer elektromagnetischen Welle auf Blech | formula |
| EM-Felder von AM-Radiostation | formula |
| Strahlungsdruck von Welle | formula |
| Lichtmühle | formula |
| Strahlungsdruck von Laser | formula |
| Kraft einer elektromagnetischen Welle | formula |
| Magnetische Feldstärke | formula |
| Magnetfeld bei Beschleunigung von Proton | formula |
| Laserstrahl statt Hochspannungsleitung | formula |
| Mit Laserkanone im Weltall | formula |