Physics: Post your doubts here!

[Thought blocker]

lol...ok

Is voltage a vector or scalar quantity?
Answer:
In DC(direct current) circuits, voltage is scalar. But in the case of alternating-current(AC) voltage is vector quantity. It is because in an AC circuit the current is changing the direction for every time period. Therefore, since in this the direction matters its a vector quantity.
Regards.


#==>Why isnt it the same for current that current is vector in Ac but scalar in DC

 

[mehria]

Is voltage a vector or scalar quantity?
Answer:
In DC(direct current) circuits, voltage is scalar. But in the case of alternating-current(AC) voltage is vector quantity. It is because in an AC circuit the current is changing the direction for every time period. Therefore, since in this the direction matters its a vector quantity.
Regards.

#==>Why isnt it the same for current that current is vector in Ac but scalar in DC

current is the flow of charges per unit tym.. the direction is chnging but the number of charges remains the same...
idk the exact explanation for ths... :/

 

[Thought blocker]

current is the flow of charges per unit tym.. the direction is chnging but the number of charges remains the same...
idk the exact explanation for ths... :/

Np..

 

[mehria]

Np..

Vectors are that quantities, in which magnitude or value is changed with direction... so for current the direction chnges but nt the value... that's the reason why it's nt a vector quantity. although it behaves as a vector quantity in ac circuits...

 

[Rutzaba]

me no physics

 

[Thought blocker]

Ok jee

 

[A star]

me no physics

you are doing Bsc in maths

 

[Thought blocker]

you are doing Bsc in maths

Bsc and in math, how ?

 

[Sam Ivashkov]

How do we improve parallax errors using set squares? In this marking scheme, http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_ms_33.pdf, on the very last page, one of the limitations are listed as parallax error and its improvement as "Detailed use of set square or pointer to improve parallax"
Can anyone elaborate on this and explain how to use set squares to improve parallax errors (preferably with a picture?)
Keeping the ruler vertical using set squares is NOT the answer since that is a separate point in the marking scheme (the 4th one)

 

[saadgujjar]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s06_qp_4.pdf
q4a and c plz

 

[Mohammed salik]

A parallel beam of light of wavelength 450 nm falls normally on a diffraction grating which has
300 lines / mm.
What is the total number of transmitted maxima?

Mohammed salik
Thought blocker
Suchal Riaz

the ans is 15

Ahh I m sorry Couldn't Reply :/!

 

[daredevil]

If separation between two molecules decreases, their Ep increases??

 

[sma786]

GMm/r^2 = mv^2/r

GM/r = v^2

Now k.e= 1/2 mv^2 = 1/2 m GM/r = GMm/2r .

Got it! Thanks

 

[sma786]

Centripetal force =mv*2/r

Gravitational force=GMm/R*2
Gracitational force provides centripetal force.
Put forces equal.find Velocitput velocity in Kinetic energy formula!

Oki thanks

 

[Rutzaba]

you are doing Bsc in maths

bs

 

[Rutzaba]

you are doing Bsc in maths

maths is considered a science subject
minors stats n phy... but im not gud enuff to help

 

[itallion stallion]

Oki thanks

N.p

 

[mehria]

Ahh I m sorry Couldn't Reply :/!

its ok

 

[A star]

maths is considered a science subject
minors stats n phy... but im not gud enuff to help

which university offers minors in Pakistan. i also wanted to do a minor :/
naa its a good choice not saying its a bad one just asking .
p.s minor in STATS . i hate it for some damn reason make stupid errors :/

 

[sitooon]

which university offers minors in Pakistan. i also wanted to do a minor :/
naa its a good choice not saying its a bad one just asking .
p.s minor in STATS . i hate it for some damn reason make stupid errors :/

Can you plz help me with q 2b(ii) & 3(b)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_4.pdf
Exam is tomorrow