Two electrically-charges spheres are suspended from insulated threads a certain
ID: 1416476 • Letter: T
Question
Two electrically-charges spheres are suspended from insulated threads a certain distance from each other.There is a certain amount of electrostatic force between them.Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios below (1 pt. ea.):
The charge on one sphere is reduced by half
The charge on both spheres is doubled
The distance between the spheres is increased by a factor of three
The distance between the sphere is decreased to one-fourth
The charge of each sphere is doubled and the distance between them is doubled
Explanation / Answer
the electrostatic force b/w two charges F=9*10^9 Q Q/r^2
case 1
the charge is becomes half
the force becomes to the half because the force is directlly propertional to the charges
case 2
both charges are is doubled
the force becomes to =F'=9*10^9*4q1q2/r^2=4F
case 3
the distance becomes 3r
the force becomes to F"=9*10^9*q1q2/(3r)^2=F/9
case 4
the distance becomes to r/4
the force becomes F'=9*10^9q1q2/(r/4)^2=16 F
case 5
the charges is doubled ,distance is doubled
the force becomes F'=9*10^9*4 q1q2/4r2=F
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