Hewitt 22.3-22.4 hw

Most atoms normally have a net charge that is

• positive in the nucleus and slightly more negative in its electrons
• positive
• negative
• zero

What is a positive ion? What is a negative ion?

• A positive ion is a neutral atom that has lost one or more protons. A negative ion is a neutral atom that has gained one or more protons.
• A positive ion is a neutral atom that has gained one or more electrons. A negative ion is a neutral atom that has lost one or more electrons.
• A positive ion is a neutral atom that has lost one or more electrons. A negative ion is a neutral atom that has gained one or more electrons.
• A positive ion is a neutral atom that has lost one or more neutrons. A negative ion is a neutral atom that has gained one or more neutrons.

When we say charge is conserved, we mainly mean that charge can be

• created and destroyed in equal amounts
• saved, like money in a bank
• constant in all bodies
• transferred without loss like money in a bank

How does one coulomb of charge compare with the charge of a single electron?

• A coulomb of charge is the charge associated with 1.6 × 10^(-19) electrons.
• A coulomb of charge is the charge associated with 6.25 × 10^18 electrons.
• A coulomb of charge is the charge associated with 1.6 × 10^19 electrons.
• A coulomb of charge is the charge associated with half the charge of 6.25 × 10^(-18) electrons.

How is Coulomb's law similar to Newton's law of gravitation? How is it different?

• Newton's law of gravitation is attractive, whereas Coulomb's law is attractive or repulsive. Both are proportional to the inverse square of distance.
• Coulomb's law can be attractive or repulsive but is inversely proportional to distance.
• Newton's law of gravitation is attractive, whereas Coulomb's law is always repulsive. Both are inverse square.
• Newton's law of gravitation is attractive or repulsive, whereas Coulomb's law is attractive only. Both are inverse square.

What is meant by conservation of charge?

• All electrons have the same electric charge.
• Whenever an electron is created, an equal and oppositely charged proton is also created.
• Net charge cannot be created or destroyed.
• The amount of charge in every nucleus is the same.

What is meant by saying that charge is quantized?

• All charged objects have a charge that is an integer multiple of the charge of an electron.
• All objects have a charge that is equal to the charge of the electron.
• All electric charges are fractions of the electron charge with a 1 in the numerator.
• All electric charge is measured in units called "quants."

Which particle has exactly one quantum unit of charge?

• Proton
• Quark
• Neutron
• Alpha particle