A) \[\frac{q}{m}\]
B) \[\frac{mg}{{{q}^{2}}}\]
C) \[mgq\]
D) \[\frac{mg}{q}\]
Correct Answer: D
Solution :
To balance the oil drop the electric force should be equal to the weight of the oil drop. ie, \[qE=mg\] or \[E=\frac{mg}{q}\]
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