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Question

In the oil drop experimant, charge on electron came out to be 1.6×1019 C. From Thomson's experiment, e/m value for electron calculated was 1.758820×1011 C/kg. Find the mass of the electron.
(Given: e is the magnitude of charge on electron)


A
1.67×1027 kg
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B
9.1×1031 kg
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C
9.1×1028 kg
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D
1.67×1031 kg
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Solution

The correct option is B 9.1×1031 kg
Charge on electron =1.6×1019 C
Value of em=1.758820×1011 C/kg
Mass of e=Magnitude of charge on eem

                   =1.6×1019 C1.758820×1011 C/kg

                   9.1×1031 kg

Chemistry

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