radio waves prac and levitation prac (1 Viewer)

[clever angel]

hi everyone,

we haven't done a single prac for this module. has ne one done teh radio waves and magnetic levitation prac, can u share it plzz

plzz help asap

 

[Helstar87]

We havn't done the levitation prac yet (we're waiting till we visit syd uni) But we did the radio waves one. It's really simple, is this the one you're talking about...
* Perform an investigation to demonstrate the production and reception of radio waves ?
Aim:- To demonstrate the production and transmission (reception) of radio waves
Equipment:- Induction coil, small transistor radio, transformer
Method:- 1) Adjust the induction coil so that there is a gap, with a spark jenping discontinuosly across the gap.
2) Adjust the tuner of the transistor radio so that it does not recieve a station.
3) The spark of the induction coil will cause a 'pulse' of static as the radio wave is detected

Hope that helps!!!

 

[zenger69]

Levitation practical I think you mean the demonstration of superconductors and the Meissner effect.

Where you cool a large magnet with liquid nitrogen to a very low temperature. Then place a smaller magnet on top. It will levitate.

As when the large magnet is cooled has an electric field and when the smaller magnetic is placed on top, it changes the flux which causes eddy currents and lenz laws says it will opppose it. Therefore the smaller magnetic hovers on top.

I hope it helps.

 

[helper]

Just correcting one point. The large object at the bottom is not a magnet, it is a superconducting ceramic, that when placed near a magnet actively repels the magnet.
This results in a magnetic field repeling the small magnet.
The magnet levitates as the magnetic force acting up is equal to the gravitational force pushing down.