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Created with Fabric.js 1.4.5 What is that? Applying the concept So What? An experiment performed by Robert Andrews Millikan in order to find the smallest unit of electric charge, which he reasoned to be on a single electron. This iscalled A charged ball, of mass 10 g, is suspended between parallel plates at 10° to the vertical. The plates are connected to a 60 V power supply and are 2 cm apart.What is the charge of the ball? Two charged oil drops are suspended in the same parallel plate apparatus at the same time. a) Do they have the same sign?b) Is it necessary that they have the same charge? c) If they do not have the same charge, the ratio of what two properties of the oil drops must be equal? The Millikan Experiment e=1.602X10^{-19} C the elementary charge. - - - - - - - - - - - + + + + + + + + + + + Oil Drop Gravitational Force Electrical Force Drops sprayedthrough hole Ty=Fgcos10°T=mgT= mg cos10°T= (0.01)(9.80) cos10°T= 0.0995 N E= V rE= 60 0.02E= 3000 N/C Fe=TxqE=sin10°Tq=sin10°T Eq=sin10°(0.0995) 3000q= 5.8x10^(-6) C Therefore, the charge of the ball is 5.8x10^(-6) C. q=Ne 10° Fg Fe Ty Tx The two drops must have thesame sign in order to hover between the same two plates. This is because the direction ofthe electric field will be constant. It is not necessary for the twooil drops to have the same charge.They can have different charges, and still be able to hover in the same apparatus. The mass:charge ratio must beequal in both drops T b) a) c) Electrostatic Speakers Car Battery
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