Answer to Question #287495 in Electricity and Magnetism for Hassan

Question #287495

In the milikan experiment,and oil drop carries four changes and has a mass of 1.8*10^-12g.it is held almost at rest between two horizontal charged plates 1.8cm apart. What voltage must there be between the two charged plates?


1
Expert's answer
2022-01-14T09:46:33-0500

The voltage must provide the field which creates the force can support the drop:


"F=Eq=mg,\\\\\nE=Vd,\\\\\nVdq=mg,\\\\\\space\\\\\nV=\\dfrac {mg}{qd}=\\dfrac {mg}{4ed}=156.04\\text{ kV}."


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