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Question

In Milikan's oil drop experiment, which of the following charges can exist on an oil drop?
Charge on electron e = 1.6×1019 C

A
2.8×1019 C
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B
3.2×1019 C
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C
8.0×1019 C
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D
11.2×1019 C
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Solution

The correct option is D 11.2×1019 C
We know that the charge is quantized, i.e., Q=ne where n is an integer.

(a) Q=2.8×1019 C
n=Qe=2.8×1019 C1.6×1019 C=1.75
Here n is a non-integer value.

(b) Q=3.2×1019 C
n=Qe=3.2×1019 C1.6×1019 C=2
Here n is an integer value.

(c) Q=8.0×1019 C
n=Qe=8.0×1019 C1.6×1019 C=5
Here n is an integer value.

(d) Q=11.2×1019 C
n=Qe=11.2×1019 C1.6×1019 C=7
Here n is an integer value.

So option (b), (c) and (d) are correct.

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