i got 2.5cm... (were u suppose to go from the gradient aye??? cos i didnt) i used a point that fitted on my line of best fit... i found the weight force in newtons wen the current was 0 and wen the current was 20 amps in the lower rod... i then subtracted them to give the force of attraction...
part a) lenz's law..flux threading through copper creates a magnetic feild that oposses the field that created it... repulsion force slows it down... conservation of energy..etc
part b) as temperature cools lattice vibrations reduced... greater currents can be produced therefore greater...
I had no idea with this question aye.. so i jus wrote the Ep formula down.. might gain a mark for identifying the right formula... ohh and isnt ur answer above being in KJ to small considering it took 1.sumthin MJ to move it just 10000km???
Hey... do you know all the speeches or do you just have a select few you can recall for the exam.. because i've noticed that in two instances they have asked to talk about a particular speech! wb
Hey all.. just wondering whether i should have a story ready for the exam?? what are the chances do you recon of gettin another form such as a Letter, Speech or Interview???