Surface Charges on Current Carrying Conductors - PhysLab

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Surface Charges on Current Carrying Conductors

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Surface charges on current carrying conductors is a well known phenomenon though seldom talked about in the introductory courses. Besides, the charges are imperceptibly small making the phenomenon difficult to observe.

In this demonstration shown in class in Fall 2015, a couple of high voltage DC converters (EMCO) are used to generate a potential drop of around 20 KV about a piece of wire that has four or five 50 Mega-ohm resistors stringed together. A light and tiny piece of wrapped up aluminum foil is hung from a nylon thread. The foil touches one end of the circuit, picks up a charge (say negative). This negatively charged foil is subsequently repelled from the same end. This indicates the deposition of negative charge on the circuit’s end. Bringing this negatively charged foil to the opposite end of the circuit while make it momentarily stick. After sticking, the process of charge sharing and repulsion repeats at the positive end.

This demonstration is inspired by Chabay and Sherwood’s book Matter and Interactions Pg. 778, 3rd Edition.

 


Classroom Demo . Electricity and Magnetism | Tags: classroom demo, electricity and magnetism
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  • Home
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  • Academics
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    • Lab-I (ENGG-100/PHY-100/200)
    • Lab-II (PHY 300/500)
    • AstroLAB
    • Ibn Sahl Corner for Optics
    • Fast Optics
    • Smart Physics
    • Single Photon Quantum Mechanics Lab
    • Chasing Cosmic Ray Muons at Physlab
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    • Class Demonstrations
    • PhysDiary
    • Health and Safety
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  • Research
    • Research Themes
    • Research Internships
    • Research Stories
    • Physics WorldCup
      • International Young Physicists’ Tournament (IYPT) 2019
      • International Young Physicists’ Tournament (IYPT) 2018
      • International Young Physicists’ Tournament (IYPT) 2016
    • Hunerkada
    • Grants
    • Theses and Reports
    • Scientific Publications
    • Invited Talks (Selected)
  • Outreach
    • Media
      • Lectures, Podcasts and Interviews
      • Videobytes
      • YouTube Channel
      • Visitors
      • Testimonials
    • The Scientific Mind Through the Eyes of a Physics Experimenter
    • National Laboratory Immersion Program
      • First Lahore 2012
      • Second Sukkur 2013
      • Third Lahore 2014
      • Fourth Lahore 2016
    • Labview Workshop 2016
    • Open house
      • 2009-2015
      • Open house 2023
    • Khwarizmi Science Society
    • Helping Pakistan’s Universities
      • National University of Technology (NUTECH) 2019
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Final Phase)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Phase 2)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2018 (Phase 1)
      • National University of Science & Technology 2016
      • Habib University 2014
      • Preston University 2013
      • Ghulam Ishaque Khan Institute of
        Engineering Sciences and Technology 2011
      • Institute of Space Technology 2010
    • The National STEM School
      • STEM School (2018 – 2019)
      • STEM school (2016 – 2017)
    • Abdus Salam Memorial Lecture Series
  • Facilities
    • Laboratories
    • Equipments
    • Devices & Softwares
      • PhysPlot
      • Physlogger
      • Phystrack
    • Mechanical Workshop
    • Inventory
    • 3D Printed Galleria
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    • Equipment Howto’s
  • PhysGPT
  • Contact Us