OCR Physics B G495 Field and Particle Pictures June 21st 2011 Exam Thread

I have a question as well in a transformer if the current is varying sinusoidally and the question asks you to sketch a graph of flux and then emf I understand that the e.m.f is simply the differential of the flux graph but should the flux graph be in phase with the current graph or inverted or what? The mark schemes I've found are never particularly clear on this one

This is going to be a bad week...


Had c4 today, I should have called 999 as I basically got raped....
And then phys tomorrow, wow... How unlucky is it for some one to get raped twice in 2 days..well hopefully the phys one will be wearing a condom...

I mean it can't be any worse than c4.... I pretty much got aids/HIV from it



Bye bye university, grrr

Btw . what's mean by spherical/point charge? n I'm still a bit confused of the flux density stuff~ why the curves are always sine curve and +- phi/2 phase?

This is going to be a bad week...


Had c4 today, I should have called 999 as I basically got raped....
And then phys tomorrow, wow... How unlucky is it for some one to get raped twice in 2 days..well hopefully the phys one will be wearing a condom...

I mean it can't be any worse than c4.... I pretty much got aids/HIV from it



Bye bye university, grrr

Flux graph is exactly the same as the current graph

No joke:
S3 today, Physics tomorrow, FP1 the next day, FP2 the day after that, FP3 the day after that, then as if that's not enough - Rise + Fall Retake on the Monday. FML.

Beat that
stop whining

This is going to be a bad week...


Had c4 today, I should have called 999 as I basically got raped....
And then phys tomorrow, wow... How unlucky is it for some one to get raped twice in 2 days..well hopefully the phys one will be wearing a condom...

I mean it can't be any worse than c4.... I pretty much got aids/HIV from it



Bye bye university, grrr

No joke:
S3 today, Physics tomorrow, FP1 the next day, FP2 the day after that, FP3 the day after that, then as if that's not enough - Rise + Fall Retake on the Monday. FML.

Beat that
stop whining

You truly are a geek

What do you want to study?

Flux graph is exactly the same as the current graph

No joke:
S3 today, Physics tomorrow, FP1 the next day, FP2 the day after that, FP3 the day after that, then as if that's not enough - Rise + Fall Retake on the Monday. FML.

Beat that
stop whining

Oh my. I thought A levels were finished by Friday! Unlucky, and good luck.

Oh my. I thought A levels were finished by Friday! Unlucky, and good luck.

A spherical charge acts like a point charge in the sense that it appears that the electric field is coming from its centre. They're electric field ines are radial.

Emf = -Ndphi/dt, phi = BA = flux

An alternating FLUX/ FLUX LINKAGE induce an emf that is also ALTERNATING. The FLUX alternates SINUSOIDALLY. The derivative of a sinusoidal wave is always a sinusoidal function that has a phase difference of 90 degrees.

Ahaha, Mechanical Engineering hopefully (providing i don't get 'raped' by physics lol)

I have a question as well in a transformer if the current is varying sinusoidally and the question asks you to sketch a graph of flux and then emf I understand that the e.m.f is simply the differential of the flux graph but should the flux graph be in phase with the current graph or inverted or what? The mark schemes I've found are never particularly clear on this one

The mark scheme said in or out of phase as well, so I assume that means completely in or out of phase or in other words $\pi or -\pi$ shifted?

Are you not taking G494 then? Thought everyone does both units in the summer.

does it mean that if it alternating current a.c , then the flux linkage is alternating?
what if it's dc then? Have I messed them all up?

AWESOME. Which Uni?