can you remember your method for it? weirdly mine involved having to log both sides, but don't know whether that's a more complex method and if there was a simpler way?
2800 or something close to that Edit: I don't remember well. Only that it was the same 1st SF
I got something like that, but my method was wrong haha I had few minutes at end and i used relationship that Boltzmann factor increases by power of 10 for a double in temperature and just done 2200x2^(3/10). Pretty sure I'm wrong cos it just makes no sense to me even now haha.
it stopped the flow of flux in the core, so the flux decreased and due to air being a good insulator, the flux density unchanged
I don't think an air gap stops flux from flowing, magnetic circuits can still work if there is an air gap, it's just air has a lower permeability? It's not so low that it stops it from flowing, such as its electrical conductivity.
I got something like that, but my method was wrong haha I had few minutes at end and i used relationship that Boltzmann factor increases by power of 10 for a double in temperature and just done 2200x2^(3/10). Pretty sure I'm wrong cos it just makes no sense to me even now haha.
I got something like that, but my method was wrong haha I had few minutes at end and i used relationship that Boltzmann factor increases by power of 10 for a double in temperature and just done 2200x2^(3/10). Pretty sure I'm wrong cos it just makes no sense to me even now haha.
I used the fact current was proportional to the boltzmann factor and workout the current for 3N as 3*the current from part a , then did the log of both sides to cancel the e^-E/kT then just rearranged for T to get 2312K seems quite complex for 3 marks haha
Yeah I was being an idiot, differentiated the thing instead of just equating cos I was like hmm yeah current is flow of electrons so rate of electrons must be differential of RHS of relationship. I know whatever I done was wrong though, but meh no more exams not worth worrying about it.
I don't think an air gap stops flux from flowing, magnetic circuits can still work if there is an air gap, it's just air has a lower permeability? It's not so low that it stops it from flowing, such as its electrical conductivity.
ah yes of course, i actually put that both flux and flux density decrease due to the crack, was purely curious as to why it couldn't be explained using permeability
Yeah I was being an idiot, differentiated the thing instead of just equating cos I was like hmm yeah current is flow of electrons so rate of electrons must be differential of RHS of relationship. I know whatever I done was wrong though, but meh no more exams not worth worrying about it.
yeah and plus you could've easily have made the marks up else where don't worry just enjoy summer whilst it lasts :P
smashed maths, chem went bad for me cos it's my best subject but didn't do well as I was expected and physics was OK, bad thing is I need 252 UMS to make the A so hopefully I will get it
Same. I worked out the value of N, then x3 then re-did the calc to get 2312.
I don't think 2800 is right.
yeah because you already worked out N from the first part using the current and charge on the electron, multiply this by 3 and rearrange by logging both sides to find T as 2312K which to me a time seemed like a plausible answer haha as a greater current flows obviously the temperature would increase from 2200K as more electrons, more collisions, more energy dissipated so temperature increases! Phew, glad i worked that one out