All Questions
41
questions
4
votes
2
answers
1k
views
Does current flow in the wire when only one terminal of the battery is earthed?
Let me specify beforehand that this question has been asked previously but I haven't been able to satisfy my curiosity.I know a battery maintains a potential difference between it's terminals , let's ...
- 1,103
3
votes
3
answers
4k
views
Grounding on the wooden floor
Let's suppose that I'm touching a live wire and standing on a wooden floor. Will I be shocked? Or e.g. standing in a plastic tub filled with water. I cannot imagine that there is a closed circle to ...
- 51
0
votes
2
answers
219
views
Why does the flow of charge even create electricity? [closed]
Okay this is a question I’ve asked a lot of places but I always get its the flow of charges and it’s like a property. What I don’t really understand is how is this flow of charges creating electric ...
3
votes
5
answers
2k
views
Basic question about electric shock
When we are negatively charged, and we touch a doorknob for example, why does the shock happen (i.e. the flow of charge)?
I understand that the electrons want to flow to positive charges, and I know ...
- 39
-1
votes
2
answers
144
views
Is my understanding of current correct?Urgent help is needed! [closed]
I had asked this question:No matter the arrangement of resistors in a circuit, a battery will still produce a current as if it were connected to an imaginary combination of the individual resistors ...
- 1,235
1
vote
1
answer
7k
views
Why is the drift velocity directly proportional to the electric field?
If I double the electric field, that should double the acceleration of electrons inside the conductor in the general direction of the electric field. But why does that double the drift velocity, and ...
- 3,075
2
votes
1
answer
170
views
Open current loops in metal conductor
Hello everyone,
I have this question, "can Ac current flow in an open circuit ?", I give the example of a coil carrying an AC current placed above a conducting surface, since we have an AC current, ...
- 130
1
vote
1
answer
181
views
Would a metal chair suspended in air be hit by lightning or not?
I was reading "The Physics of Superheroes" by James Kakalios and I came across the following paragraph:
In one scene during their climatic battle, Spider-Man manages to
deflect an electrical bolt ...
- 357
1
vote
0
answers
129
views
Conductivity and free/bound charge for conductors, insulators/dielectrics and semiconductors
I am slightly confused about the distinction between these three types of material in terms of
a) conductivity
b) the idea of free and bound charge
If we consider the distinction between these in ...
- 3,997
0
votes
2
answers
2k
views
In which terminal does current starts to flow first i.e. positive or negative?
As current(DC) flows from positive to negative terminal which is actually flow of electrons which in turn flow from negative to positive terminal.
So the question is which side of battery starts ...
- 115
0
votes
3
answers
64
views
What is the minimum safe distance a human finger can be placed away from a live contact of 16A, 250V? [closed]
what is the minimum safe distance a human finger can be placed away from a live contact of 16A, 250V and not get shock. Would this distance change if the air was humid?
Would this distance change if ...
-1
votes
1
answer
142
views
Neutralizing The Earth's Charge
The Earth's surface has a negative surface charge density of $1/10^9\,\mathrm{C/m}^2$. The potential difference of $400\,\mathrm{kV}$ between the top of the atmosphere and the surface results in a ...
- 290
0
votes
1
answer
771
views
Condition for Maximum Power in the circuit [duplicate]
Maximum Power is transferred to a load when load resistance is equal to internal resistance of source.
I want to know How ?
If I consider a source with internal resistance 'R' ,connected with ...
- 293
0
votes
2
answers
360
views
Why does $dq = \lambda (t+dt)dz - \lambda (t)dz = d\lambda dz$?
I am having trouble understanding why $$\frac{dq}{dt} = I(z) - I(z+dz) = -dI dz.$$
The question: There is an infinite wire along the z-direction. The current in the wire depends on $z$, and the ...
- 741
4
votes
7
answers
34k
views
What is the difference between conventional current and electronic current?
what is the difference between conventional current and electronic current?
How are they linked to one another?
