Every isolated object that has been measured carries charge in whole-number multiples of $e=1.60\times 10^{-19}$ C. Which property does that evidence show?

Two identical balloons are rubbed with the same wool sweater and then push away from each other. What does that show about their charges?

A neutral metal sphere contains equal amounts of positive and negative charge. Which statement about the sphere is correct?

In SI units, which unit is used for electric charge?

A student says an object has a charge of +3e. What does the plus sign mean?

Which observation is evidence that there are two kinds of electric charge?

A glass rod rubbed with silk is found to be positive. Which particle transfer best explains the rod's charge?

Which statement correctly describes the elementary charge e?

Which charge is allowed by quantization if $e=1.60\times 10^{-19}$ C?

When a plastic rod becomes negatively charged, what is true about its electrons and protons?

What does conservation of charge mean for an isolated system?

A charged object attracts a neutral paper scrap. Which explanation is consistent with charge behavior without changing the scrap's total net charge?

A plastic rod gains $5.0\times 10^{10}$ excess electrons. Use $e=1.60\times 10^{-19}$ C. What is the rod's net charge?

A metal sphere loses $2.0\times 10^{12}$ electrons. Use $e=1.60\times 10^{-19}$ C. What net charge is left on the sphere?

A tape strip has $7.5\times 10^8$ excess electrons. With $e=1.60\times 10^{-19}$ C, what is its net charge?

An electroscope knob has a net charge of $+6.4\times 10^{-8}$ C. Use $e=1.60\times 10^{-19}$ C. How many electrons were removed?

A small bead carries -3.2 nC. Use $e=1.60\times 10^{-19}$ C and $1\text{nC}=10^{-9}\text{C}$. How many excess electrons are on the bead?

A droplet gains $3.0\times 10^6$ electrons. If $e=1.60\times 10^{-19}$ C, what is the droplet's net charge?

A metal cap is charged to $+9.6\times 10^{-6}$ C. Use $e=1.60\times 10^{-19}$ C. How many electrons must have been removed?

A foam cup receives $1.25\times 10^{11}$ extra electrons. With $e=1.60\times 10^{-19}$ C, what net charge does the cup have?

A sphere has a net charge of $-4.8\times 10^{-8}$ C. Use $e=1.60\times 10^{-19}$ C. How many excess electrons does it have?

A lab sphere loses $4.0\times 10^7$ electrons. Use $e=1.60\times 10^{-19}$ C. What is the sphere's net charge?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on object A?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on sphere B?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on object C?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on bead D?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on plate E?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on object F?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on sphere G?

Use the figure and $e=1.60\times 10^{-19}$ C. What is the net charge on object H?

A rubber rod and fur start neutral. After rubbing, the rod has $-6.4\times 10^{-9}$ C. If nothing else touches them, what is the fur's charge?

Two isolated objects are touched. Before contact, object X is +12 nC and object Y is -5 nC. Afterward, X is +4 nC. What is Y's charge afterward?

A neutral acrylic rod is rubbed with cloth and ends at $+2.4\times 10^{-8}$ C. What happened to the cloth if the rod-cloth system stayed isolated?

Object A is -8 nC and object B is +2 nC before they touch. Later A is -3 nC. What charge is on B then?

A balloon becomes $-9.6\times 10^{-9}$ C after rubbing on hair. The balloon and hair were initially neutral and isolated. What is the hair's charge?

Two identical conducting spheres share charge after touching. Their total charge before touching is +10 nC. After separation one sphere has +5 nC. What is on the other?

A neutral silk cloth and neutral glass rod are rubbed. The silk ends at $-3.2\times 10^{-8}$ C. What charge is on the rod?

Object P starts at +18 nC and object Q starts at -6 nC. They are isolated together. If P later has +10 nC, what must Q have?

A foam block and wool pad begin neutral. After contact and separation, the foam block is $-1.6\times 10^{-7}$ C. Which statement must be true?

A charged sphere at +7 nC touches a neutral sphere in an isolated system. Afterward the first sphere has +4 nC. What is the neutral sphere's final charge?