1.

A charged oil drop is held stationary in an electric field. The space containing the drop is exposed to a radioactive source and drop moves with different terminal velocities v, 2v, 30, 40 ....... etc. It suggests :

Answer»

the charge is quantised
the drop carries POSITIVE charge
the drop carries NEGATIVE charge
charge is conserved.

Solution :Here `q=(6PI ETA r)/(E) (v_(0)+v)`
Now `v_(0)+v=V, 2V, 3V....etc`
`:. Q=((6 pi eta r)/(E))V. [(6pi eta r)/(E)]2V, [(6pi eta r)/(E)]3V....`
`=q.,2q,3q....`
Thus, charge is quantized.


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