Recent content by smokedvanilla

Hi Scatterbrain, This video shows a successful magnetic levitation. He has stated that he used ~520 turns insulated aluminium wire and applied voltage of around 66V, 50Hz. Anyway, my trial was not successful as it was too dangerous to use such a high voltage in the school science lab.

Thank you about the graph, I understand that now :D I tried working the amplitude expression out, https://www.google.com/search?q=damping+ratio+formula&es_sm=91&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAWoVChMIn-qy07aPxwIV1Y-OCh2PVwZU&biw=1277&bih=637#imgrc=ArC96HvFuNB9TM%3A Since ξ is the...

The ga is the graph wrong because zeta should be 1 instead of 0.4 when critical damping occurs? I think I understood the concept.

First of all, thank you for your reply. Which gives ξ=c/(2*√mk), so c is the damping coefficient & 2*√mk is the damping coefficient in the case of critical damping?

Hi, I have been looking for formulae for the damping coefficient, and I found two different formulae for it. http://www.xyobalancer.com/xyo-balancer-blog/viscous-damping-coefficient This webpage states that damping force, Fd is given by Fd=-cv, where c is the damping coefficient while v is the...

Thank you for your advice, @Jeff Rosenbury and @jim hardy! :)

I'm trying to induce a current in a coil of wire. I'm using a power pack, and the voltage is 13V. I'll find out about the gauge and current on Monday. I'm supervised by a teacher.

It's a school project and I'm being supervised by a teacher. I used 13V from the power pack, the frequency of current is 50Hz.

Thank you for your replies, billy_joule, anorlunda, meBigGuy and jimhardy. I'm sorry I think I wasn't clear enough in stating the conditions of my experiment. It is carried out under room conditions, and the copper wire is used as a solenoid and is coiled around 3 iron nails. It magnetized...

I'm using a fairly thin (I don't know the SWG number) copper wire as it is the only wire available in my physics lab. It has not exactly broken down yet, but I could smell the plastic burning so it's not a good sign..

I'm not sure about the exact value of currents, but I'm sure it's below 10A. Using a thicker wire reduces the resistance, so doesn't the current increase in this case? Since power dissipation is P=I^2R, I suppose a thicker wire won't really help in this case..?

Hi, I was conducting an experiment under high voltage and the plastic insulation of my wire started melting, so I'm looking for an alternative insulation. The wire used needs to be insulated to prevent short-circuit. May I know if cloth-covered wirings are only insulated with cloth, or with a...

Noted. Thank you! :)

Thank you for your replies! What the does the shape of the loop in I2 represent? Page 2 in this link http://www.innospection.com/pdfs/Eddy%20Current%20Theory.pdf talks about eddy current in cubic/cuboid metal plate, so I deduce that metal plates are also capable of producing repulsive force...

Hi, I am working on an experiment to investigate the effect of electrical conductivity of the metals on the levitating force produced. Basically the concept is this: when a metal plate is placed on top of a solenoid (but not touching), as the a.c. flows in the solenoid the change in magnetic...