Question

In oil drop experiment, the following charges were experimentally determined for five oil droplets $1.2\times {10}^{-18}unit$ , $3.0\times {10}^{-18}unit$, $6.0times{10}^{-18}unit$ $2.4\times {10}^{-18}unit$ $3.6times{10}^{-18}unit$(unit is arbitrary). What should be the charge ob electron in this arbitrary unit?

Answer 1

The magnitude of the charge should be smallest and other charges should be integral multiples of that smallest charge.

So, in the data given here,

the smallest charge is $1.2\times {10}^{-18}$

and all other charges are integral multiple of it.

Therefore,

The charge on electron $=1.2\times {10}^{-18}$