Chapter 6.2 - Electric Fields Flashcards Preview

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Flashcards in Chapter 6.2 - Electric Fields Deck (23)
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1

Electric Field

A region in which charged bodies will experience a force

2

What causes an electric field

A charge

3

How to model a charged sphere

Can be modelled as a point charge when considering outside of the sphere

4

How electric field lines work

They show the movement of a positive particle. The closer they are the stronger the field.

5

Basic formula for electric field strength

E = Force per Charge (F/Q)

6

What is the force between two charges proportional to

The product of their charges,
1 / distance^2

7

What is the electric field strength proportional to

charge,
1/distance^2

8

Similarities between an electric and gravitational field in terms of their strength (2)

Both proportional to the value of the charge/mass at a point which is causing the field
Both proportional to 1/r^2

9

Difference between electric and gravitational fields

Gravitational fields are always attractive whereas electric fields can also be repulsive

10

Fundamentally what is an electric field

One example of a field giving rise to a force

11

Equation for electric field strength between to parallel oppositely charged plates

E = V/d

12

What is special about a uniform electric field

The force/field strength is the same at any point

13

Motion of a stationary particle when put in a uniform field

Accelerates towards one of the plates depending on its charge

14

Motion of a particle moving perpendicular to a field that moves into the field

Will continue with same horizontal speed but will accelerate towards one of the plates. Forms a parabola.

15

Permittivity

Measure of a materials ability to resist an electric field

16

Equation for capacitor in terms of permittivity

εA/d

17

How relative permittivity relates to actual permittivity

Multiply relative permittivity by the permittivity of free space (ε0) to obtain actual permittivity

18

Electric Potential

Work done per unit positive charge to move that charge from infinity to a point in an electric field

19

Electric Potential Energy of a charged object

The work done to move that charge from infinity to it's current position

20

Electric potential at infinity

0

21

How is potential difference related to electric fields

The electric potential at a point is the potential difference between that point and infinity

22

How can a charged sphere be a capacitor

It just can idk.

23

What is the area under a force-distance graph between two points (with regards to electric fields)

The work done to move from one of the points to the other