AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread]

It says it is held between poles so it must be hovering which means force was upwaeds

Posted from TSR Mobile

I reckon this will be in this years. Only seen it once


Posted from TSR Mobile

The magntitude of electric force between two point or point-like charges is directly proportional to the product of each charge and inversely proportional to the square of their separation.

It's also the equation of force between 2 point charges


Posted from TSR Mobile

In this question i get why it is 224 but dont know why it is negative.

Posted from TSR Mobile

How many UMS do you need or a B across the whole a level? And how many UMS is unit 4, unit 5 and empa out of?


Posted from TSR Mobile

EDIT: Calculator has a mind of its own.

Yeah, i strongly agree with you. There is quote from John lock:

"It is one thing to say that one is in error and another to put him in the possession of the truth".

I'm actually really proud of you when you suggested your answer without knowing the answer. You shouldn't be depending on what people think of you.
Good luck with your revision


Posted from TSR Mobile

Yeah, i strongly agree with you. There is quote from John lock:

"It is one thing to say that one is in error and another to put him in the possession of the truth".

I'm actually really proud of you when you suggested your answer without knowing the answer. You shouldn't be depending on what people think of you.
Good luck with your revision


Posted from TSR Mobile

But I did put him in the possession of truth....

His reasoning was not right and I tried to make it very clear to him that his reasoning was not 100% right since it is only a couple of days left till the exam.
He also did not need to say this to the other person as to make him feel as if he's dumb: "come on, that's pretty straight forward"

They're the same thing. Flux is just the amount of flux passing through a loop of wire (one turn), while flux linkage takes into account all the loops that the flux is passing through.

If there was a field passing through a coil with N turns and you were asked for the flux through the coil, you would simply state the flux through one of the coils: BA. On the other hand, if you were asking for the flux linkage (total flux through the coil), you would just add up the flux through each of the N loops to get: $\underbrace{BA+BA+BA+\cdots +BA}_{N\ \text{terms}}=N\times BA=BAN$.

EDIT: Typo

Can someone help me with this question please?



I understand how A and C are correct but I do not see how B is correct.

And the answer is D.

Thank you in advance.