*MEGATHREAD* BMAT discussion for 2015 entry

This appears to be a question that requires basic knowledge of electromagnetic induction/generators, which I've never seen in a BMAT paper before (at least not in the new 2009+ spec) - where did you find the question?

You can find a solid explanation of the concepts here at BBC Bitesize - http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/electric_circuits/mainsproducedrev1.shtml

The question is describing the classic process by which AC (alternating current) is generated in, for example, power plants. Ultimately, the goal is to spin a coil of wire, in a magnetic field, and this magically "creates" current. So in power plants, coal, gas etc is burned to heat a massive container of water, which turns into steam, which rises up goes through a tube and in doing so, spins a coil which "creates" electricity.

If you've read about generators/electromagnetic induction on the BBC Bitesize website, you would know that increasing the speed of coil turning would increase the frequency of the alternating current, and also increase the amplitude. The EMF (which basically means voltage) is dependent on the amplitude, and so that will also increase.

PS: The "resistive load" is irrelevant. It just means "the current is driving something that has resistance" which doesn't change anything about the question.

Help! This q is from 2003 aptitude and skills section. I kind of get why E is the answer but I would like to check my understanding by someone else providing an explanation of why E is the answer and not the others.
Thanks in advance

Can anyone recommend the best way to revise physics for BMAT if you haven't done it at AS?

I was planning on getting some GCSE revision guides but if anyone can advise I'd be very grateful!

Attachment not working?

Hey there! I think it should work now? If not I'll send a web link instead.

If you look at the shape of the graph, it's a sigmoidal curve - in the middle of the graph there is a "steep bit" where a small increase in volume results in a large increase in depth (relative to the rest of the graph). This means that in the middle of our container, we need a small increase in volume to result in a larger increase in depth than the others.

Translated into simple English, this means that our container needs to be thinner in the middle than at either end. E is the only one that fits the bill.

I'll try and explain that a bit more in depth, as it's a somewhat difficult concept in the context of this question. Imagine two glasses. One of them is fat, and one of them is thin. Let's say we add 100ml to each glass. Naturally, the water would reach a higher height (i.e.: depth) in the thinner glass than in the thicker one. Therefore, we can say that for a given increase in volume (100ml or whatever), we get a bigger increase in depth for the thinner container.

This is exactly the scenario we want in this question. The graph starts off shallow, gets steeper, and then goes shallow again. This means that the container is fat initially, then gets thinner, and then gets fat again ==> E.

Hope that helps!

Look on here (BMAT Section 2 Syllabus - Everything you need to know) to see a list of the topics you need. The website www.physicsnet.co.uk is very good at explaining the concepts, as is BBC Bitesize. Revision guides aren't necessary, but they might help.

I just can't do the critical thinking questions...

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Those are quite easy for you I think

I applied for medicine this year, did both the UKCAT and BMAT. If anyone has any questions about them fire away

Hey I am a graduate student, and when I was at 6th form (all those years ago!) there wasn't much information out there about the different medical aptitude tests. After reading some of these posts I still haven't found an answer to my pretty simple question! Basically I have booked my UKCAT test for late August (trying to be organised for once!) but now that Leeds University have changed their admissions I am now required to sit the BMAT test as well. This would be fine as I have found a location that actually do the test near where I live. My question is basically…. Am I right in thinking that the test date (5th of November) is AFTER the deadline for UCAS, would this still be ok for the 2015 entry??? This is confusing me so much more than the actual BMAT itself!!!