electromagnetism

Question 1

coulombs law

Answer 1

magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them

Question 2

coulombs law equation

Answer 2

F=Q1Q2/4πε0r^2

Question 3

is force vector or scalar

Answer 3

vector

Question 4

what is an electric field

Answer 4

is the region that surrounds electrically charged particles in which a force is exerted on other electrically charged particles.

Question 5

where does charge reside in a conductor

Answer 5

the outer surface

Question 6

what is the electrical field inside a conductor

Answer 6

0

Question 7

electrostatic shielding

Answer 7

when a conductive material is used to enclose a device that is effected by an electric field

Question 8

electrical force per unit POSITIVE charge

Answer 8

electric field charge

Question 9

the force that a positive +1C would experience if placed in an electric field

Answer 9

electric field strength

Question 10

electric field strength equation

Answer 10

E=F/Q

Question 11

electric field strength units

Answer 11

newtons per coulomb

Question 12

two uses of the inverse square law

Answer 12

electric field strength and the gravitational field

Question 13

where is the charge concentrated in an electric field

Answer 13

the centre

Question 14

electric field strength equation

Answer 14

E=Q/4πε0r^2

Question 15

what is electric field strength measured in

Answer 15

newtons per coulomb

Question 16

is electric field scalar of vector

Answer 16

vector

Question 17

explain the electric field strength graph

Answer 17

electric field strength is 0 until radius is reached on x axis

a sudden slope downwards from radius point

Question 18

what is the electric field strength inside the sphere

Answer 18

0

Question 19

what is the electric field strength outside the sphere

Answer 19

Equal to point charge Q in the centre of the sphere

Question 20

electrical potential definition

Answer 20

the work done in moving unit positive charge from infinity to that point

Question 21

the radial field

Answer 21

the electrical potential at a distance from a point charge

Question 22

what is electrical potential measured in

Answer 22

V or jules per coulomb

Question 23

describe the electrical potential graph

Answer 23

electrical potential is at its highest until radius is reached

graph slopes off less steep

Question 24

change in electrical potential energy

Answer 24

work done

Question 25

applications of electrostatic defelections

Answer 25

deflection experiments to measure the charge to mass ratio for the electron

Question 26

what is the potential difference definition

Answer 26

the work done in moving one coulomb of charge from one point to the other against the electric field,

Question 27

what is milikans oil drop experiment used for

Answer 27

to determine the size of the charge of an electron

Question 28

what is an electron volt

Answer 28

a unit of energy, often used in high-energy particle physics.

Question 29

electron volt definition

Answer 29

the energy acquired when one electron accelerates through a potential difference of one volt.

Question 30

value of one electron volt

Answer 30

1.6x10-19

Question 31

ferromagnetic materials

Answer 31

materials which can become permanently magnetised

Question 32

common materials of ferromagnetic materials

Answer 32

iron steel cobalt and nickel

Question 33

what are magnetic dipoles

Answer 33

the tiny magnetic effects outer shell electrons cause.

Question 34

how are magnetic dipoles usually aligned

Answer 34

in domains that are random and cancel each other out

Question 35

what happens when a ferromagnetic material is placed within a magnetic or electromagnetic field

Answer 35

the material is magnetised

Question 36

what happens when a ferromagnetic material is magnetised

Answer 36

the magnetic dipoles align themselves with the magnetic field they are in creating a strong uniform magnetic field.

Question 37

how can a bar magnet be demagnetised

Answer 37

heating up

Question 38

how can a ferromagnetic create a permanent magnetic field

Answer 38

by heating the cooling fully

Question 39

how can a magnet lose its magnetism other than being heated up

Answer 39

mechanical shock

Question 40

what is a magnetic field

Answer 40

a region of space round a magnet where another magnet will experience a force

Question 41

what does the relative spacing of feld lines around a magnet show

Answer 41

the fields strength

Question 42

what direction do the field lines travel

Answer 42

north to south

Question 43

what happens when a current flows through a wire

Answer 43

a circular magnetic field is produced (left hand rule)

Question 44

what happens when current flows through a coiled wire

Answer 44

create a magnetic field like the bar magnet

Question 45

what happens in the middle of a solenoid

Answer 45

an almost uniform magnetic field

Question 46

how can the magnetic field of a solenoid be increased

Answer 46

wrapping it round an iron core increasing number of coils

Question 47

what is the direction of magnetic field dependant on in a solenoid

Answer 47

direction of current flow

Question 48

what would happen to earth wihtout a magnetic field

Answer 48

atmosphere would be stripped away by solar wind

Question 49

magnetic induction (B)

Answer 49

the strength of a magnetic field at a point

Question 50

equation for magnetic induction

Answer 50

B=μ₀I/2πr

Question 51

what is magnetic induction (B) measured in

Answer 51

tesla

Question 52

what is one tesla

Answer 52

the magnetic induction of a magnetic field in which a conductor of length one METER carrying a current of one AMPERE PERPENDICULAR to to the field is acted on by one newton of FORCE

Question 53

how can magnetic induction be measured

Answer 53

hall probe search coil

Question 54

force on a current carrying wire in a magnetic field equation

Answer 54

F=IlBsinθ

Question 55

movement of a charged particle in a magnetic field

Answer 55

F=qvB

Question 56

what path does a charged particle take in a magnetic field

Answer 56

circular

Question 57

centrepedal acceleration equation

Answer 57

a=v^2/r

Question 58

centripedal force equation

Answer 58

F=mv^2/r

Question 59

radius of path equation

Answer 59

r=mv/qB

Question 60

what happens when a particle enters a field at an angle

Answer 60

will follow a helical path

Question 61

what is the pitch

Answer 61

the distance between adjacent loops in the helix after on period

Question 62

pitch equation

Answer 62

P=vcosθT

Question 63

frequency of rotation equation

Answer 63

f=qB/2πm

Question 64

what is orbit frequency NOT based on

Answer 64

speed or radius

Question 65

what is orbit radius based on

Answer 65

charge to mass ratio magnetic induction

Question 66

why is kinetic energy constant

Answer 66

orbital speed is constant