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Homework Statement
Imagine that space invaders could deposit extra electrons in equal amounts on the Earth and on your car, which has a mass of 1200kg. Note that the rubber tires would provide some insulation. How much charge Q would need to be placed on your car (same amount on earth) in order to levitate it (overcome gravity)? (Hint: Assume the separation distance is the radius of the Earth- and that the Earth's charge is sprea uniformly so it acts as if it were located at the Earth's center.)
Homework Equations
Fg =Gm1m2/ d2
and possily: F= kq1q2/d2
The Attempt at a Solution
So i think you would first find the force of gravity between the Earth and the car, however from there I am not sure how you would determine the charge from that in order to lift the car. Could someone please help me with this part?