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Honors Physics > Static Electricity, Charge, and Fields Quiz > Flashcards

Static Electricity, Charge, and Fields Quiz Flashcards

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1
Q

Static Electricity

A

Stationary electricity, study of charges at rest and the interactions between them

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2
Q

how can you think of an electric field

A

one charge creates a field, a second actualizes the electric force.

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3
Q

how do charged objects exert a force

A

by changing the space around them

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4
Q

Electric Field

A

the force field, the changed property of space around a charged object

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5
Q

units of the electric field

A

N/C (newtons/coulomb)

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6
Q

is electric field vector or scalar?

A

vector

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7
Q

The electric field on an object is

A

the amount of electric force exerted per unit of charge.

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8
Q

what is the equation for electric field

A
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9
Q

Electric & Gravitational Fields Compared

A
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10
Q

how is E similar to g

A

Just like a mass in a gravitational field, the electric force that is exerted on a charge in an electric field depends on the magnitude of the electric field.

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11
Q

what is another way to calculate the strength of an electric field

A

use the magnitude of the charge that creates the field

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12
Q

Electric Field Map

A

A set of electric field lines representing the electric field around a charged object

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13
Q

The direction of the electric field lines represents

A

the direction of the electric force on a positive test charge

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14
Q

The density of the field lines represents

A

the strength of the electric field

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15
Q

true or false: Electric Field lines never cross

A

true

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16
Q

Electric Field to Charged parallel plates

A
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17
Q

Electric Field Due to 2 positive Charges

A
18
Q

Electric Field Due to a Dipole

A
19
Q

The arrows show

A

the direction of motion/force for a positive charge

20
Q

A dipole

A

a pair of charged particles that have equal but opposite charges

21
Q

electric field around a point charge (positive or negative)

A
22
Q

An electric field is said to exist where?

A

anywhere an electric force is felt. Placing a positive test charge in a field and observing its path creates a segment of a “field map.”

23
Q

what is the unit of charge

A

coulomb

24
Q

true or false: protons and electrons have equal charges (same magnitude)

A

true

25
Q

1 coloumb is equal to?

A

C=6.24x 10^18 e

26
Q

an electron is equal to

A

1.6x10^-19 C

27
Q

coloumb’s law

A

the force btw. 2 charges is equal to some constant times the first charge times teh second charge divided by distance between them squared

28
Q

what is the symbol for charge

A

q

29
Q

charged object

A

has unequal amounts of positive and negative charge

30
Q

Neutral object

A

has equal amounts of positive and negative charge

31
Q

is charge scalar or vector

A

scalar

32
Q

is charge conserved

A

Charge is conserved: when charge is transferred between objects equal amounts of charge are separated (the gain in + charge of one object= the gain in –charge of the other)

33
Q

properties of charge (list 6)

A
  1. Two types of charge: positive and negative (charge is a scalar)
  2. Charge is conserved: when charge is transferred between objects equal amounts of charge are separated (the gain in + charge of one object= the gain in –charge of the other)
  3. Charges have an effect over a distance
  4. Charge is quantized: the smallest possible charge an object can have is the charge of a proton or electron (+/- 1.6 x 10-19 C)
  5. Objects with like charges repel, objects with opposite charges attract
  6. Materials vary in their ability to hold charge(insulators/conductors)
34
Q

Conductors

A

don’t hold charge well (allow electrons to move freely)

35
Q

exs of conductors

A

Aluminum

Gold

Copper

All Metal

You!

36
Q

Insulators

A

hold charge well (don’t allow electrons to move freely)

37
Q

exs. of insulators

A

Plastics

Ceramics

Cloth

38
Q

How can we charge objects?

A

Objects can be charged in 3 different ways: friction, conduction, and induction

39
Q

Charging by Friction

A

When objects made from different insulating materials are rubbed together, electrons are transferred from one to the other

Ex:

  • a balloon and wool
  • hair and a plastic comb
  • glass and silk
40
Q

Charging by conduction

A

2 conducting objects, with different net charges, come in contact with each other, causing electrons to move from one to the other

Ex:

  • two copper wires
  • a human hand and a charged metal object
41
Q

Charging by Induction

A

A charged object is brought close to a conducting neutral object, causing the electrons in the neutral object to be rearranged

The neutral object becomes polarized (no net charge, but electrons and protons are unevenly distributed in the object)

If one side of the object is then grounded (connected to a source of infinite charge) it becomes charged overall

42
Q

Electric Force

A

A force of attraction or repulsion between charged objects

A field force

Depends on the amount of charge, the type of charge, and the distance separating the objects

Smaller distance greater force

More charge greater force

Honors Physics (3 decks)

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