A positively charged insulating rod is brought close to an object that is suspen

Question

A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude: A) the object is positively charged B) the object is negatively charged C) the object is an insulator D) the object is a conductor E) none of the above Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes: A) F/16 B) F/8 C) F/4 D) F/2 E) F

Explanation / Answer

a) the object is positively charged ..the force of replusion must act in between them,

b)F = kq1q2/ R^2

new force = K ( 0.25q1) (0.25 q2) / (0.5R)^2

new force = 1/4 ( Kq1q1/R^2)

correct option is C

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