Physics Final: Chapter 22

Particle A has twice the charge of nearby particle B. Compared to the force on Particle A on Particle B is a) half as much b) the same c) twice as much d) four times as much e) none of the above

c

The electrical force between electric charges depends only on their a) magnitude b) separation distance c) both of these d) neither of these

c

When a car is struck by lightning, the resulting electric field inside a car is a) normally huge, but for a brief time b) small enough to be safe for a passenger inside c) zero

c

3 charges that are separated by one meter exert 1N forces on each other. If the magnitude of each charge is doubled, the force on each damage is a) 1N b) 2N c) 4N d) 6N

c

Charge carriers in a metal are electrons rather than protons because electrons are a) negative b) smaller c) loosely bound d) none of the above

c

A conductor differs from an insulator in that a conductor has more a) electrons than protons b) protons than electrons c) energy than an insulator d) faster moving molecules e) none of the above

e

The electrical force on a 2-C charge is 180N. The electric field where the charge is located is a) 20 N/C b) 30 N/C c) 60 N/C d) 90 N/C e) 120 N/C

(d)

Electric shielding within a conductor is a consequence of a) the balancing of opposing forces b) both the attraction and repelling nature of electricity c) cancellation of electric field lines d) all of the above e) none of the above

?

2 charged particles held a certain distance apart are released. As they move, the acceleration of each decreases. Therefore, their charges have a) the same sign b) opposite signs c) need more info

a

2 charges separated by one meter exert 1N forces on each other. If the charges are pulled 3 meters apart, the force on each charge will be a) 0.11N b) 0.33N c) 0N d) 3N e) 9N

a

A negatively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes a) positively charged b) negatively charged c) partially charged d) completely discharged e) none of the above

a

An electron and a proton a) attract each other b) repel each other c) neither attract nor repel each other

a

The electrical force between electric charges depends only on their a) magnitude b) separation distance c) both of these d) neither of these

a

2 protons attract each other gravitationally and repel each other electrically. The stronger of these 2 forces is a) gravitation b) electrical c) neither of these

b

A main difference between gravitational and electrical forces is that electrical forces a) attract b) repel or attract c) obey the inverse0square law d) act over shorter distances e) are weaker

b

A reason for electric shielding inside a conductor is that any free electrons inside would a) not obey the inverse-square law b) be set in motion until equilibrium is established, on the outside c) cancel one another d) all of the above e) none of the above

b

Conducting materials are composed of atoms with a) strong cohesive forces between them b) loose outer electrons c) excess neutrons compared with protons d) vastly more charge than insulators

b

Superconductors most often require a) high operating temperatures b) low operating temperatures c) magnets

b

The primary purpose of a lightning rod is to a) attract lightning and guide it to the ground b) discharge the structure to which it is attached c) cancel the electric field within the structure to which it is attached d) induce a charge opposite to that of charged clouds overhead

b

2 charged particles repel each other with a force F. If the charge of bot particles is tripled and the distance between them is also tripled, then the force will be a) F/2 b) F/4 c) 2 F d) F e) none of the above

d

A positive ion has more a) electrons than neutrons b) electrons than protons c) protons than neutrons d) protons than electrons e) neutrons than protons

d

It is said that electric charge is conserved, which means that electric charge a) may occur in an infinite variety of quantities b) is a whole number multiple of the charge of one electron c) will interact with neighbouring electric charges d) can be neither created nor destroyed e) is sometimes negative

d