All Questions
38
questions
0
votes
1
answer
148
views
charge on the capacitors
When we connecting a capacitor to a battery of $V$ volts. After it is completely charged, it is disconnected from the battery, and if we connected to another capacitor. In this case, there is no ...
- 23
1
vote
0
answers
92
views
Drift velocity in Silicon wafer
I have been asked the following question in a problem sheet:
A $100mm$ diameter, $0.5mm$ thick silicon wafer at room temperature has a charge carrier
density of $1.5×10^{10} cm^{-3}$. A potential ...
- 349
3
votes
1
answer
1k
views
Distribution of current of a rotating cone
If I have a hollow cone (surface with no bottom cover ) as the one in the picture. The cone has surface charged density $\sigma$. It rotates around the symmetry axis with an angular velocity $\omega$. ...
- 738
-2
votes
3
answers
1k
views
Combination of cells
There are m*n identical cells of emf E and internal resistance r connected in parallel rows. This combination of cells is connected across an external resistance R. For what arrangement of the cells ...
- 426
1
vote
1
answer
302
views
Circuits and Power [closed]
"The diagram below represents a simple circuit composed of 5 identical light bulbs and 2 flashlight batteries. Which bulb (or bulbs) would you expect to be the brightest?
a) V only
b) V and W only
...
- 57
-1
votes
1
answer
1k
views
Electric circuit question [closed]
http://www.fisme.uu.nl/nno/opgaven/bestanden/Ronde1-Theorie-2009.pdf, question 5:
You have to calculate Id when the switch at S is opened, when its
closed, the Id = 0.5 A. All resistors are the ...
- 637
0
votes
1
answer
4k
views
Capacitance and Light Bulb And Dielectric Slab [closed]
An electric lamp having coil of negligible inductance connected in series with a
capacitor and an AC source is glowing with certain brightness. How does the
brightness of the lamp change on reducing ...
- 125
-4
votes
1
answer
196
views
Amount of 2 amperage [closed]
I have 2 equation describing the alternating amperage $I_1$ and $I_2$. I need to get amount of these amperages.
My equations:
$$I_1=10\sin(\omega t+30)$$
$$I_2=20\sin(\omega t-50)$$
How can i make ...
- 109