Pasco ES-9070 COULOMB BALANCE User Manual

012-03760E05/99© 1989 PASCO scientific $5.00COULOMB BALANCEInstruction Manual andExperiment Guide forthe PASCO scientificModel ES-9070IncludesTeacher&

Coulomb Balance 012-03760E612345side viewtop view➅ Rotate the bottom torsion wire retainer (do not loosenor tighten the thumbscrew) until the index li

012-03760E Coulomb Balance7Experiment: (Part A) Force Versus Distancesuspendedsphereslidingsphereslide assemblypendulumassemblyProcedure➀ Set up the C

Coulomb Balance 012-03760E8➁ Plot q versus R2Either of these methods will demonstrate that, for relatively large values of R, the force is propor-tion

012-03760E Coulomb Balance9(Part C) The Coulomb ConstantIn parts A and B of this lab, you determined (if all went well) that the electrostatic force b

Coulomb Balance 012-03760E10Measuring the Charges, q1 and q2Method I:The capacitance of an isolated conductive sphere is given by the equation:C = 4 p

012-03760E Coulomb Balance11Therefore C = Ctest (Vtest - V)/V. Once youve measured the capacitance C, measure the charge ofthe charged sphere is foll

Coulomb Balance 012-03760E12mgmg/qmq0 mg20 mg40 mg50 mg70 mgTable 2. Force CalibrationData and CalculationsTorsion constant = KtorB1 - 4a3/R3Rqqavgqc

012-03760E Coulomb Balance13To replace the torsion wire, follow the numbered stepsin Figure 9. When you're done, follow the instructionsin the Se

Coulomb Balance 012-03760E141. a. Use the allen wrench toloosen both set screwsone full turn.b. Thread the wire in thedirection shown.c. Do not tighte

012-03760E Coulomb Balance15Teacher’s GuideExperiments: Parts A-CTorsion Wire CalibrationJJJJJJ00.00010.00020.00030.00040.00050.00060.00070.00080.0009

Notes16Coulomb Balance 012-03760D

Technical SupportFeedbackIf you have any comments about the product or manual,please let us know. If you have any suggestions onalternate experiments

012-03760E Coulomb BalanceiTable of ContentsSection PageCopyright, Warranty and Equipment Return...iiI

Coulomb Balance 012-03760EiiCreditsAuthor: Bruce LeeEditor: Dave GriffithEquipment ReturnShould the product have to be returned to PASCOscientific for

012-03760E Coulomb Balance1The PASCO Model ES-9070 Coulomb Balance(Figure 1) is a delicate torsion balance that can be used toinvestigate the force be

Coulomb Balance 012-03760E2TheoryTake one gram of protons and place them one meter awayfrom one gram of electrons. The resulting force is equal to1.5

012-03760E Coulomb Balance3The Coulomb Balance and the included accessories areshown in Figure 2.Equipment(The Coulomb Balance and the slide assembly

Coulomb Balance 012-03760E4IMPORTANT: If you live in an area wherehumidity is always high, and if you have no facilitiesfor controlling humidity, the

012-03760E Coulomb Balance5SetupNote  Threading the Torsion Wire: TheTorsion Balance is shipped to you with the wirealready threaded. However, if it