Physics: Post your doubts here!

[talha-_-khan]

Is answer A ?

no The answer is c and this is how i got the answer

 

[Thought blocker]

no The answer is c and this is how i got the answer

Suchal Riaz Quoted me :
according to the given information R3 gives 2 volt out of 5. which means R3/(R1+R2+R3) * 5
in C only this equation gives 2 volts as expected.
4/10 * 5 = 2V

 

[talha-_-khan]

THE ANSWER SHOULD BE 1/3 V , BUT THE ANSWER IN BOOK IS 2/3 V

 

[Martee100]

Could someone help me with May/June 07 Paper 4 Q2 c

 

[Suchal Riaz]

y did u take height for column q as x and not 2x?

i am not taking the pressure on the bottom. you can't do that. i am taking pressure as where i pointed out in that picture. see it again.

 

[Suchal Riaz]

THE ANSWER SHOULD BE 1/3 V , BUT THE ANSWER IN BOOK IS 2/3 V

the answer is correct. its 2/3 V how did you do it?

 

[Suchal Riaz]

THE ANSWER SHOULD BE 1/3 V , BUT THE ANSWER IN BOOK IS 2/3 V

the potential on the first wire is 5/15 * 2 = 2/3 V
potential in the second wire is 10/15 * 2= 4/3 V
their difference is 2/3 V
which is potential difference.
i know why you are confused.
the place where the wire is joining is actually where there is a little dot. that is junction. where the wire pass straight through it is not a junction.
this might help

 

[chocolate_girl]

i am not taking the pressure on the bottom. you can't do that. i am taking pressure as where i pointed out in that picture. see it again.

U took 2x for height in Pp and x for height in Pq, i dont get y u dint take that x im so sorry for troubling so much but i dun ge it

 

[chocolate_girl]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w05_qp_1.pdf

Mcq 11
Y is the ans B wen both forces should be giving resultant?
Suchal Riaz

 

[hela]

% uncertainty
how to calculte it
http://freeexampapers.automaticpapers.com/as-a-level/physics-9702/9702_w13_qp_51.pdf
paper 51 Q 2 e) ii

 

[mahabaloch]

i need to sleep. i will answer in the noon today. if i forget please remind me.

Hey you didn't answer... Plz help me

 

[hela]

% uncertainty
how to calculte it
http://freeexampapers.automaticpapers.com/as-a-level/physics-9702/9702_w13_qp_51.pdf
paper 51 Q 2 e) ii

 

[talha-_-khan]

the potential on the first wire is 5/15 * 2 = 2/3 V
potential in the second wire is 10/15 * 2= 4/3 V
their difference is 2/3 V
which is potential difference.
i know why you are confused.
the place where the wire is joining is actually where there is a little dot. that is junction. where the wire pass straight through it is not a junction.
this might help

Now i got it thanks

 

[farhan141]

How is the potential of second wire 10/15 *2 i am confused shouldn't it be 5/15

Because of the resistors (4) being in parallel (2) and series (2)... The first wire has 2 resistors in parallel. I hope Im correct :3

 

[usama321]

the potential on the first wire is 5/15 * 2 = 2/3 V
potential in the second wire is 10/15 * 2= 4/3 V
their difference is 2/3 V
which is potential difference.
i know why you are confused.
the place where the wire is joining is actually where there is a little dot. that is junction. where the wire pass straight through it is not a junction.
this might help

Actually Suchal, the potential at the terminal in the first wire is 10/15 *2. Had there been resistors of different resistances, you would have gotten the wrong answer. At the terminal in the second wire, it would be 5/15 *2. Your answer gives a negative value, which is not same as the positive value anyway

 

[Suchal Riaz]

Actually Suchal, the potential at the terminal in the first wire is 10/15 *2. Had there been resistors of different resistances, you would have gotten the wrong answer. At the terminal in the second wire, it would be 5/15 *2. Your answer gives a negative value, which is not same as the positive value anyway

The wire which you called wire one, i called it wire two. Oversmart usama.

 

[Suchal Riaz]

y did u take height for column q as x and not 2x?

i took pressure of the orange mark. so height will be 2x and x respectively of p and q. if we would have taken the pressure of bottom point then it would have become more complicated.

 

[chocolate_girl]

i took pressure of the orange mark. so height will be 2x and x respectively of p and q. if we would have taken the pressure of bottom point then it would have become more complicated.
View attachment 39874

Ok thanks

 

[Suchal Riaz]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w05_qp_1.pdf

Mcq 11
Y is the ans B wen both forces should be giving resultant?
Suchal Riaz

what do you mean by two forces? there is only one force: weight.
so the only force, weight, acts vertically. so A is the answer. not B.

 

[usama321]

The wire which you called wire one, i called it wire two. Oversmart usama.

Lol kk. My mistake. But you don't have to be a complete jerk -_-