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

did anyone else get like 4.96 kg for the mass of uranium used??

did anyone else get like 4.96 kg for the mass of uranium used??

I got this but the general consensus is that it isn't the right answer

The answer to the X-Ray Q was 400 and something people.

I used the normal equation, i thought it would be average because the normal flux linkage/time graph is a curve, but we calculated the straight line gradient between the points and 0... so i guessed that our equation didn't take into account this curve?

I got the same, fairly certain its right.

but the normal equation assumes that the ring is cutting through the maximum amount of flux over the entire time period - it gives a peak emf not an average one

but the normal equation assumes that the ring is cutting through the maximum amount of flux over the entire time period - it gives a peak emf not an average one

the rate of change of flux was the change in flux (all of it cos it drops to 0) divided by the change in time (which was given). Was it not just this? There was no peak because it was a constant emf and not alternating?

the rate of change of flux was the change in flux (all of it cos it drops to 0) divided by the change in time (which was given). Was it not just this? There was no peak because it was a constant emf and not alternating?

If everyone is saying they found it easier than other past papers grade boundaries will be higher not lower than previous G495 papers.

But so many people got around 1000kg... but that is hella' lot of uranium

The answer to the X-Ray Q was 400 and something people.

question asked for an ''average emf''

if you think about it rotating - at the end its perpendicular to field lines so cuts more lines at the end of the rotation, so generates more emf

The emf was chaging because it rotated 1/4 of the way.

I meant flux, I always write those two the wrong way round.

It wasn't it was 4.25 because I got 425 but used 3 instead of 0.03 for 3%