Physics: Post your doubts here!

[The Sarcastic Retard]

View attachment 60185 View attachment 60186 H

Only this will be helpful?
I have seen questions like why voltage is maximum when probe is parallel to magnetic field and stuff..
Thanks..

 

[princess Anu]

Does anyone has any notes on doppler effect
Do we have to do it for A2?

 

[princess Anu]

http://papers.gceguide.com/A Levels/Physics (9702)/9702_w13_qp_43.pdf
What should be the answer to Q5ciii

 

[The Sarcastic Retard]

http://papers.gceguide.com/A Levels/Physics (9702)/9702_w13_qp_43.pdf
What should be the answer to Q5ciii

Chill

 

[The Sarcastic Retard]

Does anyone has any notes on doppler effect
Do we have to do it for A2?

Check the syllabus

 

[The Sarcastic Retard]

Explain why the alternating current in the primary coil of a transformer is not in phase with the alternating e.m.f. induced in the secondary coil.

 

[princess Anu]

Explain why the alternating current in the primary coil of a transformer is not in phase with the alternating e.m.f. induced in the secondary coil.

Because the current in the primary coil is in phase with the flux in the core
But not the change in the flux, (change in the flux is not in phase with the flux in the core) ,and it is the change in flux that generates the alternating emf hence we say Alternating Current is not in phase with the Alternating emf

 

[princess Anu]

Yeah but what if it were
What could have been the possible side...:/

View attachment 60187
Chill

 

[princess Anu]

I can't visualise this question
Which part of the needle is oscillating and how is it oscillating( which direction)? why is the amplitude 11mm? + in bi needle should be at its max height, i get it , but why is this max height 14mm below cloth or 8mm above cloth?
Can someone draw on the figure and explain
Please



bi

 

[The Sarcastic Retard]

Yeah but what if it were
What could have been the possible side...:/

There is a mistake in that part of question. So we are confused.

 

[The Sarcastic Retard]

Because the current in the primary coil is in phase with the flux in the core <-------- How do we know this??
But not the change in the flux. <-------- change is flux wont be generated as we using ac?

So why does change in the flux not in hase with flux in the core.

 

[The Sarcastic Retard]

I can't visualise this question
Which part of the needle is oscillating and how is it oscillating( which direction)? why is the amplitude 11mm? + in bi needle should be at its max height, i get it , but why is this max height 14mm below cloth or 8mm above cloth?
Can someone draw on the figure and explain
Please



biView attachment 60196

No one solved my this doubt. I had the same doubt a month ago.

 

[areeba240]

helpppp plzzzzzzzzzzzzzz
thanks in advance

 

[areeba240]

helppppp plzzzzzzzz
thanks in advance

 

[farhan141]

Because the current in the primary coil is in phase with the flux in the core <-------- How do we know this??
But not the change in the flux. <-------- change is flux wont be generated as we using ac?

So why does change in the flux not in hase with flux in the core.

Im also confused with this bs. I have not studied it anywhere that this happens but in marking scheme they have explained as if we know it.

 

[The Sarcastic Retard]

Explain why the alternating current in the primary coil of a transformer is not in phase with the alternating e.m.f. induced in the secondary coil.

Physicist

 

[The Sarcastic Retard]

 

[The Sarcastic Retard]

@

I can't visualise this question
Which part of the needle is oscillating and how is it oscillating( which direction)? why is the amplitude 11mm? + in bi needle should be at its max height, i get it , but why is this max height 14mm below cloth or 8mm above cloth?
Can someone draw on the figure and explain
Please



biView attachment 60196

Physicist

 

[The Sarcastic Retard]

tell me from which year and paper this is. i remember explaining this.
or give me the question itself

http://papers.gceguide.com/A Levels/Physics (9702)/9702_s15_qp_42.pdf
7b) found

 

[The Sarcastic Retard]

see 1033 at
http://physics-ref.blogspot.com/2015/10/physics-9702-doubts-help-page-216.html

I dont understand that lines u have written.