yes the copper is stuck onto the silica. At room temperature the disc is flat to a few nanometres and when its cooled it makes a cup/bowl shape and the edges lift by around 1 mm
Hi,
I have been looking at hoop stresses and the information I have found hasn't been all that useful to me as I am having a hard time converting the thermal contraction of a system into a pressure for the equation (stress=a+b/r^2). This is the thick walled hoop equation
The disc is a few...
ok i think for a
the charge will be q due to symetry
the distance r between to corner and centre is the same so if the extra one has the same charge it will just all cancal out.
b)
0=kq/r+kq/r+kQ/r
rearanged and simplifed
Q=-2q
now with the extra charges the rest should fall into...
electromagnitism
Homework Statement
there are 2 questions to this.
1) you have a equlateral triangle with 2 charged particles q in the corners. by choseing the third particle make the centre of the triangle have 0
a)field
b)porential
in case a what is the potential in case b what is the...
Hi,
i have 2 questions for electromagnitism and i just can't do them. my lecturer is just not up to the job of teaching and everyone is struggling and its probably something easy. anyway rant over.
1) you have an equlateral trinagle with chare q in 2 corners. what charge would you have to...