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Results tagged with electromagnetism
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user 8234
The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.
0
votes
How is the polarity of a magnet decided (before its creation)?
When you run a DC current through a coiled wire, it will create a magnetic field, with a polarity determined by the direction of the current. The polarity can be determined by the right-hand rule. Not …
- 11.2k
0
votes
How to make something charged using electricity?
Previous posters have explained how to charge objects using various methods.
As metals are conductive, they cannot be permanently charged: the charge will leak away when it touches other things. The …
- 11.2k
4
votes
How fast does current flow? And the magnetic field?
There are 2 ways of looking at the speed of an electric current.
The electrons themselves move quite slowly: of the order of 1.0 m/hour. In other words, if you have a 1m long cable, an electron will …
- 11.2k
1
vote
Accepted
Negatively charged ball orbiting positively charged ball in space?
As safkan & Brionius have said, as a first guess the resulting orbit is just as stable as a normal Newtonian one. There is a catch however.
The problem with this planetary system is exactly the same …
- 11.2k
2
votes
Accepted
Current or Current Density?
It's the current density $J$ that changes.
Current is defined as an amount of charge per seconds, $I=Q/T$, i.e. a number of electrons flowing through the wire every second. Once your conductor is co …
- 11.2k
2
votes
What happens to a compass below an AC line?
The current in the wire changes direction 100 times per second. There is no way the compass needle could follow those changes; they happen way too fast to move the needle. In other words, the currents …
- 11.2k
1
vote
Does alternating current come from DC?
AC can be made from DC, and vice versa. DC is a steady voltage, with AC the voltage fluctuates from negative to positive and back, many times per second.
Most electricity generators generate AC. The …
- 11.2k
32
votes
Why is there no magnetic field around a wire connected to electricity at home?
I can see 2 possible reasons why your phone does not detect a magnetic field.
First, a magnetic field is generated when current flows. A simple wire carries no current. So, unless the wire is part of …
- 11.2k
3
votes
Would A Ground Connection Be Considerd An Open Path?
A circuit is closed only if current can flow. This means that there must a continuous connection from the voltage source through the load and back.
If one point of your circuit is connected to ground …
- 11.2k
0
votes
What is a "gravitational cell"?
Both the title of the article ("How batteries work: a Gravitational Analog") and the abstract clearly state that the gravitational cell is used as an analogy. This is used to explain the movement of e …
- 11.2k
2
votes
Why does electromagnetic induction creates both voltage and current but static electricity o...
With static electricity, the electrons cannot move because the material used is an insulator. Hence there is no current. If the material were conductive, then a current would flow, and there would be …
- 11.2k
2
votes
Underground river of lightning?
Electric current travels in a loop: it goes from one pole of the generator, through the circuit, and back to the other pole of the generator. As a result, the electrons never "pile up" anywhere. If a …
- 11.2k
1
vote
Why is EMF equal to PD when circuit is "open"?
As you stated, we can think of a real battery as an ideal one with an internal resistance $R_i$. This battery is then connected to an external circuit with resistance $R$. Those 2 resistors form a vol …
- 11.2k
2
votes
Interaction speed between electric charges and magnetic materials
As electricity and magnetism are both part of electromagnetism, both of them travel at light speed. …
- 11.2k
1
vote
Crossover frequency in RC filter circuits
The problem is that you are talking in absolutes: either a frequency is passed, or it is not.
An RC circuit does not work that way. No frequency is completely passed or blocked. With a C-R filter (R …
- 11.2k