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AQA Physics A Unit 4- 11 June 2014

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Reply 1180

BigBadJFly

Original post by doctoreleanor

I got towards the plate on the left and -30, not sure if that's right though! :smile:

Think thats what I put as well :smile:

Reply 1181

jcarz

Original post by EdenHazard

Did anyone get a big value for resistance? like to the 6 I think it was?

think I got like 480000 ohms or something. Must be wrong but then again the current was very low so i've absolutely no idea. I just numbers in the formula.

Reply 1182

Ryejd

Original post by Bob296

what did everyone get for the displacement from point p on that circle question (section a)?

1,6

Reply 1183

Mandragoran

Original post by Bob296

what did everyone get for the displacement from point p on that circle question (section a)?

0.16m

Reply 1184

TheNote

The gpe and elastic potential are equal at equalibrium

Posted from TSR Mobile

Reply 1185

BigBadJFly

Original post by danielmoreton12

What did you get?

Reply 1186

Davelittle

Original post by Ryejd

I mentioned that the electrons accumulate on the plate, and this results in the flow of electrons reducing as they experience and electrostatic force of repulsion.

I don't know man, this wasn't a great paper for me

That's spot on mate that's exactly what happens!

Reply 1187

mintsponge

Original post by doctoreleanor

I got towards the plate on the left and -30, not sure if that's right though! :smile:

I said this as well, because the field was going to the right (more positive to less positive) so a negative ion would experience a force to the left, being attracted to the more positive plate. And since it's attracted, it loses energy.
(Could be wrong though don't take this as the answer)

Reply 1188

GC3AT2

Original post by BigBadJFly

I thought that geostationary was used for communications :s-smilie:

They can be, but non-geostationary can be as well.
If you've ever used a Satellite phone, you'll know that you sometimes have to wait for a satellite to move into your range. They're comms satellites and they aren't geosynchronous

Reply 1189

Yellow Jelly

Did anyone get the resistance value for the capacitance question to be around 540?

Reply 1190

Rock_Set

Original post by BigBadJFly

Think thats what I put as well :smile:

Snap!

Reply 1191

BigBadJFly

Original post by Davelittle

Towards X and it gained 30eV of potential energy because you were moving it in the opposite direction to the force

I said to left, but I put that it lost PE though, but that was just a guesstimate :biggrin:

Reply 1192

jcarz

Original post by wofldog

As I recall there were no units on the Y-axis; nowhere does it indicate the potential energy was 0 when it was minimum. For some reason in physics you're allowed to draw axes which don't start at 0 (?!?!).

I thought it did say zero at the bottom. It didn't put a max value on the y-axis but I remember being confused that it said zero at the bottom of the y-axis. Maybe it didn't and i'm being a fool but I thought I saw a zero.

Reply 1193

Bob296

Original post by Mandragoran

0.16m

you mean 1.6m? if so then woop woop!

Reply 1194

Rock_Set

Original post by jcarz

think I got like 480000 ohms or something. Must be wrong but then again the current was very low so i've absolutely no idea. I just numbers in the formula.

Me too, around about 430000 I think

Reply 1195

Davelittle

Original post by BigBadJFly

Think thats what I put as well :smile:

It doesn't lose (-)30ev of potential energy it gains it, you're moving it away from where it wants to go (opposite direction to the force) so have to put work in to move it therefore it gains 30eV of potential energy