ALL PHYSICS DOUBTS - POST HERE !!

[holtadit]

im doing physics p6 at 3 in ksa!!!!
its 10:30 now,,,im nervous!!!

Its one of the easiest Paper 6’s ever. I just finished it.


DON’T ask me any questions about whats coming as that would be against the rules.

[Fastal]

i finished around 3 hours ago, it was sh*t easy

[Adzel]

Same to me...already done...very easy Al7amdullah.

[$H00t!N& $t@r]

It's good to see guy so relaxed. I hope i can say the say after the exam which is in like... 4 hours from now!
Good luck every1 for the physics exam and the ones after this!

[Vin]

"An electron beam is equivilent to an electric current, but without the wire. It can bla bla bla.... In this diagram, the magnetic field is at right angles to the electron beam, so the beam is deflected."
This is what my book says... but how come the electrons go down (srry for bad quality). If u use Flemingooo's left hand rule, the current is ur middle finger(so points to the left [direction of electrons]), the field is ur second finger (pointing into the paper[direction of magnetic field]) and so ur thumb will be pointing up, which shows how the electrons will be deflected...How come they show it going down?

YA so it is right !! it is supposed to go down .. check again !! index finger diagonally up .. middle finger pointing left .. thumb down !!

[Baladya]

YA so it is right !! it is supposed to go down .. check again !! index finger diagonally up .. middle finger pointing left .. thumb down !!

ya but in the book its going to the right... Magentic field in the paper, movement down. (its just the camera changed it). So how?

[Vin]

I think they might hav considered the beam of electron as a conventional current in the opposite direction .. which book is it ..By the way ??

[Ghost Of Highbury]

yes i remember this q, our sir told us that wenever an electron beam is given, point ur current finger to the opposite direction, like here, if its pointing left, point it to the right. i dont exactly remember the reason, ill try n get back

yes, its about the conventional current..

[Baladya]

Makes sense Aodi Thanks
Vin its the IGCSE Collin thingy book

[Vin]

Oh i hate collins .. dunno abt phy but i hate its chemistry .. can u believe its thinner thn my notebook !!

[astarmathsandphysics]

cos electrons and conventional current have opposite charge

[Baladya]

Oh i hate collins .. dunno abt phy but i hate its chemistry .. can u believe its thinner thn my notebook !!

It has nothing in it...

[Baladya]

Hey VIN. I asked u a question b4 and u said for accelerating objects u do this formula: 0.5ta (timeXacceleration) K but why the 0.5???

[astarmathsandphysics]

1/2 at^2
The 1/2 is cos accelerations is from rest
on a velocity time graph the distance is area under curve - a triangle so area =1/2base*height hence the 1/2

[Ghost Of Highbury]

To calculate the distance of accelerating objects use this formula

Distance =

u = inital velocity

v = final velocity

t = time

a = acceleration

u is generally -, so the formula boils down to

Distance =

1/2 = 0.5

Therefore,

Distance = 0.5at²