Chapter Questions
Suppose two charges are located $10 \mathrm{~cm}$ apart and feel an attraction force of 12 units. What will be the force between the two when they are placed $5 \mathrm{~cm}$ apart?
What is the SI unit of electric charge?
What do the arrows represent in a drawing of an electric field?
What is the direction of the electric field near a negative charge?
What is shown by the lengths of the vector arrows in different parts of an electric field drawing?
Suppose the electric field at a particular location is $230 \mathrm{~N} / \mathrm{C}$. How much force will be exerted on a $0.03-C$ charge at that point?
What change takes place to make one object positive and the other negative when two objects are rubbed together?
Is it possible to make one object negative without making another object less negative? Why or why not?
What atomic particle moves when electricity moves through a conductor?
What happens to the electrons in a conductor after one part of the conductor is touched by a positively charged object?
How can an electroscope be charged negatively by induction?
Optional. Suppose two charges, each $4 \mu C$, are located $20 \mathrm{~cm}$ apart. How much force is exerted on each charge?
Optional. How much charge must be on one object for it to be repelled with a force of $5 \mathrm{~N}$ by a second charge of $1 \mu \mathrm{C}$ at a distance of $1 \mathrm{~m}$ ?
Optional. How much is the strength of the electric field at a distance of $20 \mathrm{~cm}$ from a $4-\mu \mathrm{C}$ charge?
Optional. What will be the force on another $4-\mu C$ charge at the location for which you calculated the electric field in question $14 ?$ Compare this answer to that of problem $12 .$