I have no idea how this paper will go. I'm getting mid 60s on the past papers but it all seems a bit too easy. I have a feeling the 5/6 mark 'explain' questions will be the death of me.

Reply 284

pilebunker

8

Also

-Capacitors with capacitances C1 and C2 connected in series gives 1/Ctotal = 1/C1 + 1/C2
-Capacitors with capacitances C1 and C2 connected in parallel gives Ctotal = C1 + C2

(this is the opposite to resistors)

Reply 285

BP_Tranquility

5

To join in the death of me conversation, I won't be revived after tomorrow's exam

Posted from TSR Mobile

Reply 286

Freddy-Francis

9

https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202014%20(IAL)%20QP%20-%20Unit%204%20Edexcel%20Physics.pdf

Qu 17 bi?

how do they get r = mv^2 / bev

Reply 287

Freddy-Francis

9

Original post by Freddy-Francis

https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202014%20(IAL)%20QP%20-%20Unit%204%20Edexcel%20Physics.pdf

Qu 17 bi?

how do they get r = mv^2 / bev

some body help

Reply 288

pilebunker

8

Original post by Freddy-Francis

https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202014%20(IAL)%20QP%20-%20Unit%204%20Edexcel%20Physics.pdf

Qu 17 bi?

how do they get r = mv^2 / bev

F = mv^2/r and F = Bev

so mv^2/r = Bev

rearranging, r = mv^2/Bev

Reply 289

imnoteinstein

2

Jan 2012, could someone explain the second question please?

Reply 290

Sataris

21

I could use some help here.

Question 9:

https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202010%20QP%20-%20Unit%204%20Edexcel%20Physics.pdf
https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202010%20MS%20-%20Unit%204%20Edexcel%20Physics.pdf

I get the explanation in the mark scheme. But why doesn't the lamp flash when the switch is closed? Surely the sudden surge of current is as good as the sudden cut of current?

Reply 291

george_gleed

Can someone explain question 12 (d) please?
http://qualifications.pearson.com/content/dam/pdf/A%20Level/Physics/2013/Exam%20materials/6PH04_01_que_20100128.pdf

Reply 292

george_gleed

Original post by Sataris

I could use some help here.

Question 9:

https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202010%20QP%20-%20Unit%204%20Edexcel%20Physics.pdf
https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202010%20MS%20-%20Unit%204%20Edexcel%20Physics.pdf

I get the explanation in the mark scheme. But why doesn't the lamp flash when the switch is closed? Surely the sudden surge of current is as good as the sudden cut of current?

Is it not because it creates the e.m.f. instantaneously so occurs for only a short period of time?

Reply 293

Sataris

21

Original post by george_gleed

Is it not because it creates the e.m.f. instantaneously so occurs for only a short period of time?

But that's the same for opening the switch. That's why it only flashes.

Reply 294

Pecyboy3

Original post by Sataris

I could use some help here.

Question 9:

https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202010%20QP%20-%20Unit%204%20Edexcel%20Physics.pdf
https://ad57adc4f6eb5ea42b541057f16290e611d4e42b.googledrive.com/host/0B1ZiqBksUHNYcHRSNUJpeFpqNXM/January%202010%20MS%20-%20Unit%204%20Edexcel%20Physics.pdf

I get the explanation in the mark scheme. But why doesn't the lamp flash when the switch is closed? Surely the sudden surge of current is as good as the sudden cut of current?

When it's closed no emf is induced and only 1.5v travels through, not enough to exceed the 200v required.

Edit: but if you flicked it from open to closed it would flash the same.

Reply 295

AhmedBilal

2

Guys, during the anhiliation of electron and positron, do we always multiply by 2 in the calculations?

Reply 296

Runner104

Do you guys think there will be a spreadsheet question?

Reply 297

Sataris

21

Original post by Pecyboy3

When it's closed no emf is induced and only 1.5v travels through, not enough to exceed the 200v required.

Edit: but if you flicked it from open to closed it would flash the same.

Ah, looks like I misunderstood the wording of the question. Thanks :smile:

Reply 298

Ambrina

2

Original post by Runner104

Do you guys think there will be a spreadsheet question?

Possibly

Reply 299

bbyturtlexox

12

could someone please briefly explain magnetic flux?and flux linkage? and what flux cutting is?

also when do you use the thumb rule or the left hand rule

Edexcel Unit 4: Physics on the Move 6PH04 (11th June 2015)

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