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BMAT Physics > ELECTROSTATICS > Flashcards

ELECTROSTATICS Flashcards

1
Q

what is charge given in units of

A

coloumbs

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2
Q

charge affects subatomic particles in what way

A

identity

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3
Q

what are the two kinds of charge

A
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4
Q

what do like charges do

A

repel

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5
Q

what do opposite charges do

A

attract

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6
Q

positive charge comes from

A

more protons than e-

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7
Q

negative charge comes from

A

more electrons that p+

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8
Q

what is the law of conservation of charge

A

net charge of an isolated system remains constant

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9
Q

how is charge created

A

IT CANNOT BE CREATED

only transferred from one object to another

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10
Q

what happens when you rub a balloon on human hair

A

frictional charging process > transfer of electrons between the two objects that are rubbed together

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11
Q

between rubber and hair, which has a greater attraction for electrons

A

rubber

greater attraction for electrons
electron loving material

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12
Q

what happens when a rubber and hair frictional attraction are affected

A

BALLOON pulls more electrons in and become negatively charged

HAIR has electrons removed becoming positively charged

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13
Q

what is a conductor

A

materials that allow electrons to flow through

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14
Q

what is an insulator

A

materials that resist the free flow of electrons and thus resist charge

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15
Q

how does a conductor allow electrons to flow through

A

allow for the transfer of charge via the free movement of electrons

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16
Q

what is coloumbs law

A

electrical forces between two charged objects are

directly proportional to the product of the quantity of charge on the objects

inversely proportional to the square of the distance separating the two charged objects

17
Q

what is coloumbs constant

A

8.99 x 10^9 NM2/c2

18
Q

what can a charge generate in environments

A

electric field

19
Q

what is an electric field

A

electric force per unit charge.

20
Q

what will the electric force on an object exert

A

electric field of an object will exert a force on a second object that is in the proximity of its field

21
Q

how does the force exerted on a second object by a first object with an electric field depend on certain conditions

A

depends on charge upon that object
and charge generating the field

22
Q

what is the basic equation to calculate electric field

A

E = F/q

23
Q

what is the electric field equation

A

E = kQ/r2

Where K - 8.99 x 199
Q = charge creating the field
r2 = distance between

24
Q

what do electric field line diagrams show

A

direction of force.

25
Q

how are arrowheads drawn for positive atoms

A

arrowheads are pointed away from positive charges

26
Q

how are arrowheads drawn for negative atoms

A

arrowheads are pointed toward negative charges

27
Q

what happens if a beam of electrons is moved perpendicularly to an electric field between two horizontal planes

A

accelerated vertically (toward the positive plate)

28
Q

how is velocity of electrons affected when a beam of electrons is passed through an electric field

A

it’s not affected

29
Q

why is an electron beam attracted to a differing negative and electric plane of an electric field?

A

It will be attracted by the positively charged upper plate and repelled by the negatively charged lower plate

30
Q

how does potential energy arise from charges

A

charge exerts force on another charge

energy comes from collection of charges

31
Q

what happens if perpendicular movement hits an electric field

A

does not result in a change in potential

32
Q

why does perpendicular movement not affect an electric field

A

follows lines called equipotential lines/surfaces

33
Q

what property do all the lines in an equipotential surface share

A

same voltage

34
Q

is work done when an electron is sent across an equipotential line

A

no

35
Q

how is an electric dipole created

A

created by two opposite charges that have equal magnitude

36
Q

how do you calculate electric dipole momvement

A

multiply the charge on one charge by the distance

37
Q

what is the equation for electric dipole movement

A

p = qd

BMAT Physics (12 decks)

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