lab27 - Lab # 27 COULOMBS LAW OF ELECTROSTATICS...

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Lab # 27 COULOMB’S LAW OF ELECTROSTATICS Introduction: The electrical interaction between two charged particles is described in terms of the forces exerted between them. In 1783, Augustin Coulomb conducted the first quantitative measurements of these forces. He used a very sensitive torsion balance to measure the forces between two “POINT CHARGES”, that is charged bodies whose dimensions are small compared to the distance between them. Coulomb found that the force grows weaker as the distance between the charges increases, and that the force also depends on the amount of charge on each body. Coulombs Force law states that: The force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Apparatus: Coulombs Force law set-up and kit (cotton & wool squares, Polyethylene, white vinyl strips). See Figure 1 below Setup: The apparatus is set-up for you. PLEASE BE CAREFUL THE SET-UP IS DELICATE. Some features of the set-up are : a. 2 guide blocks with pith balls attached that will slide in and out of the unit. b. 1 pith ball attached to monofilament hung & centered up in the unit. c. A mirror & scale attached to the back of the unit to eliminate error due to parallax. d. Top cover to eliminate air currents. Procedure: Charging Begin by removing the right side guide block & setting it aside. Then inductively charge the ball attached to the left side guide block. Do this by rubbing the white vinyl strip with
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lab27 - Lab # 27 COULOMBS LAW OF ELECTROSTATICS...

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