8
votes
Can a satellite generate electricity by using a planet's magnetic field?
The Earth's magnetic field is very weak compared to that produced by a magnet you might '[slide] next to a coil' and the time over which the field will vary is long (> ~90 minutes for one orbit), ...
- 2,976
3
votes
Why electric field increase near the cable connected in AC 220V socket even current is zero?
The electric field depends on the potential difference (voltage) between the wires in the cable, not on the current going through the wires. The electric field will be strongest inside the cable, ...
- 36k
2
votes
Accepted
Understand power rating in layman terms
You stated that when one coulomb of charge passes through the bulb then $220\,\rm J$ of electrical energy is converted into heat and light.
This is a correct statement but you must now realise that it ...
- 97.8k
2
votes
Accepted
How do I compute the voltage accross a cell membrane given microstate of neuron (distribution of charged ions)?
The typical textbook start is the Nernst equation, which gives the reversal potential for a ion species. That is, is the electric potential that balances a given concentration gradient:
$$E_{rev}=\...
- 32.9k
1
vote
Confusing definitions of EMF
The formal definition of the electromotive force can be written as follows.
\begin{equation}
\mathscr{E} = \sum_{i} \int_{L} \mathbf {f_i} \cdot d\mathbf{l}
\end{equation}
Where $\mathbf{f_i}$ is the ...
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