Physics Demo Number: 205

Approximate Run Time:10 min

Diamagnetism of Grapes

Demo Description

Two grapes are skewered on a thin , lightweight rod near the ends.

The rod is hung from a thin cotton string with two o-rings on the rod that  can be slid till the grape dipole is balanced horizontally in the earths' gravitational field.

Subsequent  approach of a very strong magnetic field near one grape can lead to repulsion of the grape and rotation of the dipole, if all goes well in the delicate balance of forces and torques.

 

Scientific Principles

 

 

 


Equipment

  A)   2 Grapes: Supplied by lecturer.

  B)   Light weight rod to hold the two grapes.

  C)   Cotton string and stand to balance the grape dipole.

  D)   One side of Pasco EM- 8641 Variable Gap Magnet
Location

The magnet and other  apparatus are housed in Kit(187) on [B-3-4].



Instructions

The three photos show the apparatus with the single side of Pasco EM-8641 sitting on the cart near the base of the stand.

The overview of the whole setup is in the right hand photo.
  
Writeup created by David A. Burba
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