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Q.

A positively charged oil drop of charge 8×10–15 C remains stationary in the electric field between two horizontal plates separated by a distance of 2cm and having potential difference 6V. Mass of the oil drop is (g=10 ms– 2)

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a

23 × 10–16 kg

b

6 × 10–14 kg

c

12 × 10–14 kg

d

24 × 10–14 kg

answer is A.

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Detailed Solution

mg=Eq=Vdq;m(10)=6×8×10152×102m=24×1014Kg

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