All of FIELDS in 6 minutes (Gravitational & Electric) - A-level Physics Revision Mindmap
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- Опубликовано: 25 авг 2024
- Download the pdf: scienceshorts.n...
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there's a spot in heaven for you
your videos are genuinely lifesavers
This was the only topic in physics that I was struggling with. Your video made everything crystal clear. Thanks a lot for these concise notes.🙏
Something that helped me, was noticing a patter (which Science Shorts clearly noticed too with the whole circle thing).
I made an abbreviation to make all the formulas very easy to "remember" - because you only need to remember one of them.
I'm not good at explaining, but hopefully I can help the few that can understand me: so here goes...
So, the abbreviation is FEPS.
F = Force (Electrostatic Force / Coulomb's Law)
E = Energy (Electric Potential Energy)
P = Potential (Potential Difference - not to be confused with Potential Gradient)
S = Strength (Electric Field Strength)
First: Remember and learn F / Coulomb's law: QQ/4(pi)(episilon-nought)r^2
And, then simply remember that from left to right of "FEPS" you manipulate: radius, charge, radius, charge and using SFEP (FEPS but starting from Strength) you times, times, divide, divide.
That probably doesn't make sense, so here's an example: How do I go from EFS (S) to Electrostatic Force (F)?
Well, firstly F is QQ/r^2 (ignoring constant, which is the same on every formula).
To go from EFS (S) to F, you have to times by q. Why?
If you remember: "SFEP: x, x, /, /", so from S to F you times (x).
And remember: "FEPS: r, q, r, q", so from S to F you manipulate charge (q).
So, you times EFS by charge to get F.
This would also mean to go from F to S (EFS), you'd divide by q. So EFS is Q/r^2 (since F is QQ/r^2)
Makes sense?
How about going from Energy (E) to Potential (P)?
FEPS
r, q, r, q
x, /, /, x
So from E to P:
Divide by q.
To find the formula of P. You'd need to find out how to go from F to E, then E to P.
I might have over-explained, but it's really quite simple.
F to E would be times by r, E to P would be divide by q.
Therefore, since F = QQ/r^2, times by r to get: QQ/r, divide by q to get: Q/r.
The formula for Electric Potential is Q/r (don't forget the constant: 4(pi)(episilon-nought).
man gave me homework
It's amazing sir, thanks a lot
absolutely loved this ! pleaseeee keep doing more of these !!
u may have saved my exams, thanks for all ur 10 mins videos
Watching this while ironing gave me new type of anxiety haha
for the last part, is the reason it cant be 0 for like charges because at some point in the middle g1=g2 (F1=F2), and g=V/r, so V1/r1 = V2/(d-r1)?
similarly for like charges, is V=0 at some point where +V1 + (-V2) = 0 since the charge in the middle is attracted to one (positive potential as work must be done to keep it from being attracted) and repelled by the other (negative potential)? also just because V=0 doesn't mean it's stationary right?
Sir if you have a point with an electric potential of zero, there is often also an electric field strength. So if you placed a positive charge there, it would supposedly move. But how can it do this if it has a zero potential energy? How can it move and create energy from no where?
A potential of 0 is not a potential energy of 0. In fact, the opposite is true.
@@ScienceShorts but if the energy per charge is zero, no amount of charge would make it non-zero. Would a charge at zero electric potential initially move but then reach a velocity of zero so net energy is the same?
At 5:20, wouldnt g be proportional to density and radius cubed, not just density and radius?
No.
Why does your voice sound different like every video is it the same guy
Lol 😂
That's what teaching does to your voice.
Hi, why is emf in secondary coil not in phase with emf in primary coil in a transformer?
Who says they aren't?!
hi
Hello Kabita Doley