electrostatics (multiple choice from the packet)

the unit of electrical charge, the coulomb, is the charge on ____________.

a specific large number of electrons

superconductors are noted for their ________.

absence of electric resistance

a transistor (amplifies or switches charges) is an example of _______.

a semiconductor (a material that has an electrical conductivity value)

to say that electric charge is conserved is to say that electric charge _______.

can be neither created nor destroyed

normally a balloon charged to several thousand volts has a relatively small amount of what?

charge and energy

the electrical force between charges is strongest when charges are

close together

the primary purpose of a lightning rod is to ______________.

guide the lightning to the ground

to say that electric charge is quantized is to say that the charge on an object ___________.

is a whole number multiple of the charge of one electron

the electrical force between charges depends on what?

magnitude of electrical charges and the separation distance between electric charges

rub electrons from your hair with a comb and the comb becomes ___________ charged

negatively charged

a main difference between gravitational and electric forces is that electric forces do what?

repel or attract

a difference between electric forces and gravitational forces is that electrical forces include _________.

repulsive interactions

charge carriers in a metal are electrons rather than protons because electrons are ____________.

smaller, loosely bound, and negative

to be safe in the unlikely event of a lightning strike, it is best to be inside a building framed with ________.

steel

two protons attract each other gravitationally and repel each other electrically. By far the greater is _____

the electrical repulsion

a balloon will stick to a wooden wall if the balloon is charged

either positively or negatively ( The reason that the balloon will stick to the wall is because the negative charges in the balloon, from rubbing it on your negatively charged sweater for example) will make the electrons in the wall move to the other side of their atoms (like charges repel) and this leaves the surface of the wall positively charged. Because opposite charges attract, the negatively charged ballon will be attracted to the positively charged surface of the wall)

the fundamental force underlying all chemical reactions is?

electrical

which force binds atoms together to form molecules?

electrical

in an electrically neutral atom the number of protons in the nucleus is equal to the number of ________?

electrons that surround the nucleus

you can touch a 100,000 volt Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of what?

energy (increase in voltage = decrease in energy)

two charged particles held close to each other are released. As they move, the force on each particle increases Therefore, the particles have _________ signs

opposite (repel force> attraction force)

strip electrons from an atom and the atom becomes a _________.

positive ion

a positive ion has more _______?

protons than electrons

when the distance between two charges is halved, the electrical force between the charges __________.

quadruples

when a car is struck by lightning, the resulting electric field inside the car is

zero (because the electrons spread out across the steal frame of the car)