Q3 of 33 Page 63

At what distance should two charges, each equal to 1 C, be placed so that the force between them equals your weight?

Coulomb’s force of attraction between two charges is given by –



Where,


q1 and q2 = are the charges = 1C


k = proportionality constant = 9×109


r= distance between the charges


Substituting the values,



Given that, the force of attraction is equal to the weight



Assume, mass m = 81Kg and g= 10m/s2 equating above equations-




Hence for balancing an 81Kg mass of an object, a coulomb’s force with r is 3333.3 m must be applied.


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