An oil drop has a charge –9.6 × 10–19 C and has a mass 1.6 × 10–15 g. When allowed to fall, due to air resistance it attains a constant velocity. Then if a uniform electric field is to be applied vertically to make the oil drop ascend up with the same constant speed, which of the following are correct?

Engineering

Physics

Charge and coulombs Law

Question

An oil drop has a charge –9.6 × 10^–19 C and has a mass 1.6 × 10^–15g. When allowed to fall, due to air resistance it attains a constant velocity. Then if a uniform electric field is to be applied vertically to make the oil drop ascend up with the same constant speed, which of the following are correct?

the electric field is directed downward

the intensity of the electric field is $\frac{1}{3}$ × 10² N/C

the electric field is directed upward

the intensity of the electric field is $\frac{1}{6}$ × 10⁵ N/C

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