Biology; Chemistry; Physics: Post your doubts here!

[exploded diper]

Suppose you're measuring a potential difference of 4V. You start with a voltmeter that can read up to 20v. The needle only moves a little since the magnitude is small compared to the range of the voltmeter. Then you use a 5V voltmeter to measure the same pd, so that the needle almost fully moves to the right. The smaller range gives a more accurate reading.

thn y not start with low range voltmeter at the first....

 

[Faizan Muhammmad]

Umm yeah do you get this?

they are supposed to be perpendicular to scale!

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w12_ms_42.pdf
In question 1 part b ii: Can I write this:
By placing two wooden blocks at the end of the tray then measuring the distance of the traveled wave? :s made it up myself

You can measure it with a measuring tape.

 

[DaniyalK]

thn y not start with low range voltmeter at the first....

Because at the start you do not know what the magnitude is. For all you know, it could be greater than 5V. So you use a large range first to get an idea of the magnitude, then use the voltmeter of the appropriate range to get maximum accuracy.

 

[funky brat]

they are supposed to be perpendicular to scale!

Can you make one?

 

[Mahnoorfatima]

You can measure it with a measuring tape.

I know but what about the one that I made up? :3 They don't accept change in the apparatus or what?

 

[Fate0]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_42.pdf
Q4

Btw, how should I attempt such questions?

Make the voltmeter in series.

Just remember in these type of questions, ammeter is in series, voltmeter in parallel, current is same in series and different in parallel, voltage is different in series same in parallel, and resistance in series is just A+B+C while it's AxB in parallel.
-------
A+ B

 

[funky brat]

I know but what about the one that I made up? :3 They don't accept change in the apparatus or what?

No, they do accept if it's sensible. But placing blocks, will give you the distance between the blocks, the includes the container, it's thickness and if the container is not straight at edges, you'll get inaccurate results.

 

[exploded diper]

Umm yeah do you get this?

but the right angle side with the ruler..to make it more accurate...

 

[Fate0]

What you guys are dicussing right now >, right?

 

[funky brat]

but the right angle side with the ruler..to make it more accurate...

Kesay?

 

[Maganius]

Make the voltmeter in series.

Just remember in these type of questions, ammeter is in series, voltmeter in parallel, current is same in series and different in parallel, voltage is different in series same in parallel, and resistance in series is just A+B+C while it's AxB in parallel.
-------
A+ B

THanks a lot mate
I don't know to draw circuits, kinda weird but now 'cause of you I know how to draw em ^_^ Thanks a lot.
Would you do me a favor, can you please draw the circuit for this question ?

 

[exploded diper]

Kesay? [/quote

 

[Faizan Muhammmad]

Can you make one?

 

[funky brat]

What you guys are dicussing right now >, right?View attachment 41418

I got that now, Thanks.

 

[funky brat]

View attachment 41421

Shukriya.

 

[Fate0]

THanks a lot mate
I don't know to draw circuits, kinda weird but now 'cause of you I know how to draw em ^_^ Thanks a lot.
Would you do me a favor, can you please draw the circuit for this question ?

 

[peacce]

Any good pieces of advices fo tomorrow? Tensed
P.s: today's pper went a lil clumsy

 

[Fate0]

Any good pieces of advices fo tomorrow? Tensed
P.s: today's pper went a lil clumsy

Read the question. NEVER write you answers in the answer space after solving them. Recheck them in the end and then write.
My paper went very well Alhamdullilah because i gave my full time and read each question carefully. :3

 

[funky brat]

Read the question. NEVER write you answers in the answer space after solving them. Recheck them in the end and then write.
My paper went very well Alhamdullilah because i gave my full time and read each question carefully. :3

Was your paper perfect, like not a single mistake?