Coulombbalance - Science Education Centre Measuring...

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________________________ © Science Education Centre 2002 Physics/Grade 12/ LA: Coulomb Balance Science Education Centre ! SOWETO/DIEPKLOOF P.O.BOX 39067 BOOYSENS 2016 !!! " 011 9381666/7 # 011 9383603 email: sec@global.co.za Measuring Electric Forces with a Coulomb Balance Electrically charged objects exert forces on each other. However, the electric forces between charges that you can conveniently produce in a laboratory are small. To measure them at all requires a sensitive balance, good technique, and a day that is not too humid (otherwise the charges leak off too rapidly). In this experiment you will find out how the electrostatic force between two charged bodies depends on the amount of electrical charge and on the separation of the bodies . In addition - and this is very unfortunately but will nevertheless challenge and improve your technical skills - you will experience some of the difficulties in using and producing sensitive science equipment. Materials required polystyrene cup polystyrene sphere [diameter about 1cm] aluminium foil [or a conducting paint] glass jar soda straws needle or pin toothpicks plasticine (or prestik, even putty will do) light paper and glue to make a paper cone staples to be used as mass pieces pair of scissors or a sharp knife Constructing the Balance (A sketch of a balance is shown in the diagram to the right) General construction tips:
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Coulombbalance - Science Education Centre Measuring...

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