Physics: Post your doubts here!

[Anzuman turin]

Anzuman turin
26- the circumference = distance travelled by one point charge in one round. frequency means rotation per second. there are four of the point charges. so total charge pass in one second will be 4 X (2πr) X Q X F=8πrQf

ans is a A bro

 

[Suchal Riaz]

forgive me i didn't sleep last night and i don't know what i am saying. i confused it with the question in which the distance was found for work done.
I don't know why i multiplied distance.
charge per point = Q, charge pass per round=4, round per second=f
A=charge/time=charge.frequency while charge being 4Q
giving us 4Qf as final answer.

 

[Anzuman turin]

forgive me i didn't sleep last night and i don't know what i am saying. i confused it with the question in which the distance was found for work done.
I don't know why i multiplied distance.
charge per point = Q, charge pass per round=4, round per second=f
A=charge/time=charge.frequency while charge being 4Q
giving us 4Qf as final answer.

got it . thanks for the help bro . please help with other questions when you are ok

 

[daredevil]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_42.pdf

Q11 c) shouldn't the fraction here be Pin/Pout when calculating attenuation?? [considering attenuation to be positive] ??

Q5 b (i) and c

 

[ShreeyaBeatz]

People,
Tell me how to find the minimum pd here:

A cell of e.m.f. 2.0 V and negligible internal resistance is connected to a variable resistor
R and a metal wire,
The wire is 900 mm long and has an area of cross-section of 1.3 × 10–7 m2. The
resistance of the wire is 3.4 Ω.The resistance of R may be varied between 0 and 1500 Ω. What is the minimum pd?
according to markscheme- ans=4.5 x 10^-3
its of 9702/21/O/N/11 please help!

 

[sitooon]

Can someone draw the diagram ?

 

[Namehere]

Can someone draw the diagram ?

View attachment 38614

Could you tell me which year it is?

 

[Thought blocker]

Can someone draw the diagram ?

View attachment 38614

I dont why today all are asking doubts related to A2 level

 

[Namehere]

I dont why today all are asking doubts related to A2 level

whats wrong about it?

 

[Thought blocker]

whats wrong about it?

Nothing...

 

[sitooon]

Could you tell me which year it is?

I picked a random year , it says in mark scheme as i remember to draw : lamp with .. " forgot "
try it and lets see how it will be

 

[Autumngirl]

Can someone please explain why the answer to q37 of p1 mj2007 is C? I would really appreciate it if someone replies before Thursday as I have to appear for an exam on Thursday!

 

[midha.ch]

Can anyone help me with question 2?

 

[Thought blocker]

Can anyone help me with question 2?

Is this you midha.ch ?

 

[midha.ch]

Is this you midha.ch ?

Nope my ghost -_-
Help karo with your Physics brain!!!!

 

[Thought blocker]

Nope my ghost -_-
Help karo with your Physics brain!!!!

As level student hu...
sagar65265
Suchal Riaz

 

[daredevil]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_ms_42.pdf

Please explain q8 parts b and c ........

 

[midha.ch]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_ms_42.pdf

Please explain q8 parts b and c ........

I think it would be helpful if you read the attached files once. you can skip the half-life part
few things not included are,
The rate of decay is proportional to number of particles present

dN/dt ∝ N

dN/dt = -λN

part (b) asks for probality of rate of decay

part (c)(i) asks for the inittial activity and it can easily be found by the formula
part (c)(ii)
If A = λN

Then, A0 = λN0
find N0
then using
N0/NA =M/Mr

Where NA = Avogadro’s constant

Find M

 

[sudeep1097]

I don't understand mark scheme for drawing the circuit. Can anyone help me with drawing that and i don't understand why the terminals of external circuit is attached to the earthing.

No one has replied to this.. anyone???

 

[Thought blocker]

No one has replied to this.. anyone???

midha.ch
ZaqZainab
Suchal Riaz
sagar65265
sitooon