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An oil drop of mass m carrying charge –Q is to be held stationary in the gravitational field of the earth. What is the magnitude and direction of the electrostatic field required for this purpose?

An oil drop of mass m carrying charge –Q is to be held stationary in the gravitational field of the
earth. What is the magnitude and direction of the electrostatic field required for this purpose?

Grade:Upto college level

1 Answers

Arpit Mishra
11 Points
5 years ago
F=mg=-qESo E= - mg/qHere negstive sign signifies that the force is opp to the electic field This force on the oil drop act sin the down ward direction towards the earth.

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