Q.
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a
Oil droplets in the form of mist, produced by the atomiser were allowed to enter through tiny hole in the upper plate of electrical condenser
b
The air inside the chamber was ionised by passing a beam of X-ray through it
c
The fall of these charged oil droplets can be retarted
d
Magnitude of electric charge, 'q' on the droplets is always fractional multiple of the electric charge e
answer is D.
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