Exercises: Electrical Charges, Conservation of Charge, and Transfer of Charge

An atom has 6 protons and 6 electrons. What is its net electric charge?

A proton has charge $+1.6 \times 10^{-19}$ C and an electron has charge $-1.6 \times 10^{-19}$ C. What is the total charge of a system containing one proton and one electron? Express your answer in coulombs.

Two charged objects are brought near each other and repel. What can you conclude about their charges?

A positively charged rod is brought near a neutral conducting sphere. Which statement correctly describes the resulting interaction?

A glass rod is rubbed with silk and becomes positively charged. Which particle transferred and in which direction?

Two identical conducting spheres touch. Sphere A initially has a charge of $+8$ nC and Sphere B has a charge of $-2$ nC. After they touch and are separated, what is the charge on each sphere? Express your answer in nC.

A charged sphere with $-12$ nC touches a neutral sphere of identical size. After separation, what is the charge on each sphere? Express your answer in nC.

Which of the following best explains why metals are good conductors of electricity?

A negatively charged rod is brought near a grounded neutral conductor (but does not touch it). The ground wire is then removed while the rod is still nearby. The rod is then moved away. What is the sign of the charge remaining on the conductor?