A plastic rod that has been charged to -7 nC touches a metal sphere. Afterward,

Question

A plastic rod that has been charged to -7 nC touches a metal sphere. Afterward, the rod's charge is -2 nC.

(a) What kind of charged particle was transferred between the rod and the sphere, and in which direction? That is,

did it move from the rod to the sphere or from the sphere to the rod?

electrons transferred from rod to sphere

electrons transferred from sphere to rod?   

protons transferred from rod to sphere

protons transferred from sphere to rod?

(b) How many charged particles were transferred?

Explanation / Answer

  electrons moved from the rod to the sphere

Since -5nC of charge were transferred, the number of electrons transferred

were -5x10^-9C/(-1.60x10^-19C) = 3.125x10^10 electrons

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