#  Electromagnetic Properties 

 



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### Photoelectric Cell

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Photoelectric effect demonstrated with common "solar cell".

### Photoresistivity

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Photoconductivity of CdS cell moved through the continuous spectrum.

### Insulator or Conductor?

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Resistance of glass vs. temperature.

### Hall Effect

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The Hall voltage of a semiconductor is measured as a function of applied magnetic field.

\[[In-Depth Description](/presentations/hall-effect)\]

### Superconductivity 

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Meissner Effect suspension of magnet above superconducting disc.  
  
\[[In-Depth Description](/presentations/superconductivity)\]

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu