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Electrostatics: Coulomb's Law

Q- Two equally charged point mass of mass m each are suspended from a point by massless threads of length L. In equilibrium position each thread makes and angle ɵ with vertical.

(a) Find the ratio of magnitudes of horizontal electric force and vertical gravitational force on a the masses.

(b) What is the ratio if the angle ɵ = 150 ?

(C) If each mass is 0.15 gm and the length L =14 inch, what is the magnitude of excess charge on each mass?  

Solution:

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