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

1. (Original post by Bealzibub)

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2. Can someone define tesla

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3. Yeah it helped!
Thanks again!!!
4. (Original post by Bealzibub)
Need help on this too..

Change in potential is = -30V

work done = e * (-30V) = -30eV and force towards Y.

force is not towards Y, the answers is out of A and D.

the force is away from Y OR Towards X because an electron is negative and the 100V plate is +
5. (Original post by gcsestuff)
The answer to this is zero? Attachment 424513
I still don't understand

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Because all forces are equal and equidistant so they cancel out
Correct me someone if I'm wrong
6. (Original post by gcsestuff)
Can someone define tesla

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F = BIL

therefore, B = F/IL

> N A^-1 m^-1

force per current per metre.
7. (Original post by CD223)
I agree! What grade are you aiming for?

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As high as possible, I need a B in physics overall, so the higher this is, the less pressure I have next week. What are you going for?

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8. (Original post by Kennethm)
I got C, not sure what the right answer is though.
The answer in the mark scheme is zero. There's a few diagram with different charges. I'll take a photo to explain

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9. When do you use the Right hand rule?
10. (Original post by gcsestuff)
Can someone define tesla

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The magnetic flux density of a magnetic field that causes a force of 1N to act on a current of 1A in a wire of length 1m which is perpendicular to the magnetic field.

That was from a previous paper I think or the AQA text book. It's "wordy" unfortunately but quite simple at heart.
11. (Original post by Sumz.96)
When do you use the Right hand rule?
For force induced due to the motor effect? I believe

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12. (Original post by gcsestuff)
Can someone define tesla

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one weber per square metre,
13. (Original post by gcsestuff)
The answer to this is zero? Attachment 424513
I still don't understand

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If you were to draw the field lines for each of the charges, then there would be a point in the centre where the field lines would repel.
14. (Original post by Sumz.96)
When do you use Right hand rule?
When you're moving say a bar through a magnetic field. This induces a current. The same fingers still apply and the force is what the person is doing to it so say a person pulls a bar up with a magnetic field into the page an induced current will be induced going right.

Is to do with lenzs law which is - the direction of induced emf opposes the change that created it.

So using both the left hand and right hand rules we can see that if a bar in pushed one way a magnetic force will act in the opposite direction.

I think this is right

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15. (Original post by Klaxoii)
As high as possible, I need a B in physics overall, so the higher this is, the less pressure I have next week. What are you going for?

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Makes sense! Need an A

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16. ugh just come out of a chemistry exam. head's that mashed I don't even know where to start with physics 4 revision tonight.
17. DOn't mean to be a pain but how did you get from 100 to 800? Thanks
18. I need 46/75 going of last years boundaries to get my c in physics (all I need) so prayin

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19. Can someone list what happens when you travel along field lines, along lines of equal potential, etc for electric and magnetic fields?
I don't really get the work done thing/ force on particle in these situations
20. (Original post by Klaxoii)

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Thanks, only just saw it now, weird it didn't come in my notifications

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