Q1 wrongBCCCCACCABDDACA
can someone mark me
i choked and i dont wanna do it
2 wrong
4 wrong
... need i say more?
Q1 wrongBCCCCACCABDDACA
can someone mark me
i choked and i dont wanna do it
Q1 wrong
2 wrong
4 wrong
... need i say more?
I got the same as you except for 11 which I thought was D, I could be wrong though. Multiple choice was quite tricky I thought.1 C
2 A
3 C
4 D
5 C <too easy, at first i thought it was talking about force from solar wind
6 A
7 C
8 C
9 C
10 B
11 B
12 D
13 B
14 C
15 A
Those are my answers and they're the exact same as the guy behind me :S
Its jsut a hell of a lot different to my answers... i could be wrong.
Same here for 11 D, I really think F of AB should be a sine curve.I got the same as you except for 11 which I thought was D, I could be wrong though. Multiple choice was quite tricky I thought.
11 is definately NOT D. the force on the wire is constant and up, until the commutator switches it.I got the same as you except for 11 which I thought was D, I could be wrong though. Multiple choice was quite tricky I thought.
in that case i got the same as you, i now know nine is (a) i didnt read electrons, and assumed current also i got (a) for 13I got the same as you except for 11 which I thought was D, I could be wrong though. Multiple choice was quite tricky I thought.
The wire is perpendicular to the magnetic field, at that moment in time the motor would rely on momentum to push it to get it started, where torque is also at a maximum. Plus, the force on AB is actually down, I'm pretty sure of it.11 is definately NOT D. the force on the wire is constant and up, until the commutator switches it.
force is proportional to sintheta... therefore its D11 is definately NOT D. the force on the wire is constant and up, until the commutator switches it.
The lattice still has small vibrations at low temperatures.in that case i got the same as you, i now know nine is (a) i didnt read electrons, and assumed current also i got (a) for 13
is anyone on my side that 13 is (a)?
my reasons are that electrons dont experience attraction to one another, and that even if ure gonna call them bonding together attraction its not as a result of low temps and is a result of low temps affect on the lattice, are people saying that (a) is wrong because there are still small lattice vibrations? from my understanding a metal in superconducting has movement but no vibrations can anyone explain/elaborate?
the way i tought was that the Cooper pairs actually CREATE the vibrations, so not A. not C or D obviously. so B.The lattice still has small vibrations at low temperatures.
According to BCS theory, an electron will attract protons behind it, causing a small lattice distortion that creates a small positive field, attracting another electron. The electrons then exchange phonons and move as one particle, contributing to superconductivity unimpeded by the lattice, and the process continues - hence Cooper Pairs.
true... i fell into that trap in trial dammitwell, in 11, (D) starts at zero, so wrong. its not asking for the force perpendicular to the coil, but the force ONLY on AB.
for 13 i got B but im not too sure...
lol ummm yeah but what is theta? hmm i wonder if it could be? yes it its! the angle between the conducter and the field which is :O always 90 degrees hence :O sintheta =1 hence answer is B (current switches)force is proportional to sintheta... therefore its D
yea i knowlol ummm yeah but what is theta? hmm i wonder if it could be? yes it its! the angle between the conducter and the field which is :O always 90 degrees hence :O sintheta =1 hence answer is B (current switches)