Biology; Chemistry; Physics: Post your doubts here!

[kirann]

The current changes its direction in Dc motor while rotating? :S
The function of carbon brushes in DC AC is the same? to reduce friction between the commutators?

only a.c changes its direction. d.c does not.
well i need to confirm the brush thing too

 

[Lilly2318]

View attachment 42779 View attachment 42780
explain anyone

What's the ans im also confused

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_22.pdf
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_ms_22.pdf
Q2 (a)
see ms, it states all about its formula. then where did that definition go "turning efffect of force is moment of force"? 0.0

the same ppr, Q6 (b) (i)
funky brat, i remember u said when it is said about current, we consider it "convectional current", so why is it stated in ms that current is "flow of charge/electrons"?

Q8 EITHER (b) (i)

Ahmad, it's written electric current/ electronic current which is flow of electrons. I said if they haven't mentioned anything.

 

[funky brat]

View attachment 42779 View attachment 42780
explain anyone

Is that A for 33?

 

[asadalam]

Ahmad, it's written electric current/ electronic current which is flow of electrons. I said if they haven't mentioned anything.

Guys current is simply rate of flow of electric charge which we can see by its formula I=Q/t

 

[funky brat]

Guys current is simply rate of flow of electric charge which we can see by its formula I=Q/t

They asked for definition.

 

[funky brat]

Guys, how are you doing Physics MCQ's, like doing the whole papers? Does this take a lot of time?

 

[asadalam]

They asked for definition.

That minus the formula,is the exact definition,rate of flow of charge.

 

[Faizan Muhammmad]

Guys, how are you doing Physics MCQ's, like doing the whole papers? Does this take a lot of time?

 

[Faizan Muhammmad]

Kal say karra hoon, khatam hee nae horahay aur abhee chm k bhee parey hain

 

[funky brat]

That minus the formula,is the exact definition,rate of flow of charge.

You're right. I was just explaining him how this can be electrons.

 

[Maganius]

Kal say karra hoon, khatam hee nae horahay aur abhee chm k bhee parey hain

I haven't even touched Chem
Will solve few past papers before exam

 

[funky brat]

Kal say karra hoon, khatam hee nae horahay aur abhee chm k bhee parey hain

 

[asadalam]

Chill karo,mai abhi movei dekh ra hoon

 

[Faizan Muhammmad]

Chill karo,mai abhi movei dekh ra hoon

baad main phir A kar atay ho , parh lo abhee

 

[funky brat]

Chill karo,mai abhi movei dekh ra hoon

Main ne chill he kia hai hamesha islye ab parhna parh raha hai, apki aur bat hai.

 

[funky brat]

baad main phir A kar atay ho , parh lo abhee

Ap nay parh kay bara teer maar lia hai. Phir bhi C he kar ae.

 

[Maganius]

Chill karo,mai abhi movei dekh ra hoon

Mene Physics kr prep. aj shru ke hy

 

[Maganius]

Ap nay parh kay bara teer maar lia hai. Phir bhi C he kar ae.

CRO pr kis type ke Qs aate hein?

 

[Faizan Muhammmad]

Ap nay parh kay bara teer maar lia hai. Phir bhi C he kar ae.

to sahih kia na, all teachers are with us
and dont say bachon nay sawal sahih nae btaya, A walay logg to jaisay teachers k pass gaye hee nae iss liyah C walon nay jhotee sazish kee