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Question

In Millikan's oil drop experiment, the charge of three oil drops X, Y and Z have been found to be 2, 0.04 and 0.8 respectively. What could be the number of electrons attached to oil drop X?

A
1
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B
20
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C
40
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D
50
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Solution

The correct option is D 50
From Millikan's oil drop experiment, lowest charge of a particle has been calculated.
Here charges on each particle are,

X=0.04×50
Y=0.04
Z=0.04×20
From the above data, it can be seen that 0.04 is lowest possible charge. Hence, probable charge of electrons is 0.04 C.

No. of electrons of X=50
No. of electrons of Y=1
No. of electrons of Z=20

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