Electron Suspended Between the Surface of The Earth

AI Thread Summary
To determine the charge required for an electron to remain suspended between the Earth and a fixed positive point charge at a distance of 6.37 m, one must analyze the forces acting on the electron. The gravitational force acting on the electron is balanced by the electrostatic force from the positive charge. Using the equations for gravitational force and Coulomb's law, one can set up an equation to find the unknown charge. The gravitational force is calculated using g = 9.8 m/s^2, while the electrostatic force involves the Coulomb constant. Solving this equation through algebra will yield the required charge in coulombs.
PepeF.
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Homework Statement



An Electron remains suspended between the Earth (assumed nueutral) and a fixed positive point charge, at a distance of 6.37 m from the point charge.
Determine the charge for this to happen.
answer must be in C.

Homework Equations


g= 9.8 m/s^2
Coulomb constant = 8/98755e9 N* m^2/C^2
Kc= 8.99e9
Fe= Kc (q1*q2)/r^2

The Attempt at a Solution



I am confused with this question,. please help me out
 
Last edited:
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What's the question asking for?
 
1Kris said:
What's the question asking for?

it says

determine the charge for this to happen
 
Well think in terms of force of the condition that causes this equilibrium. Write down the equation for the two forces involved and the rest is just simple algebra (then a calculation when you stick the numbers in).
 
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