Fields

Question 1

Definition of Gravitational fields

Answer 1

It is a space where a small test mass experiences a force due to another mass.

Question 2

Definition of Electrostatic fields

Answer 2

It is a space where a small positive charge experiences a force per unit charge

Question 3

Definition of electric potential

Answer 3

The capacity for doing work by a change in position of the positive test charge. Also known as voltage

Question 4

Definition of gravitational potential

Answer 4

The gravitational attraction a point P is equal to work done per unit mass required to take a test mass from infinity to point P

Question 5

2 properties of gravitational potential

Answer 5

Always negative and when it is infinite it is equal to zero

Question 6

2 components of equipotential surfaces

Answer 6

Points with the same gravitational potential can be joined together to form an equipotential surface.

Field lines are perpendicular to equipotential surfaces.

Question 7

Explain density of field lines

Answer 7

It is positively correlated to the field strength.

Question 8

What does E(p) stand for?

Answer 8

Potential energy, for gravitational and electrical

Question 9

What does g stand for?

Answer 9

Field strength

Question 10

What does V(g) stand for?

Answer 10

Gravitational potential

Question 11

What does V(e) stand for?

Answer 11

Electric Potential

Question 12

What does E stand for?

Answer 12

Electrical Field strength

Question 13

What does G stand for?

Answer 13

Gravitational Constant

Question 14

What does k stand for?

Answer 14

Coulomb constant

Question 15

What does M stand for?

Answer 15

Mass

Question 16

What does Q stand for?

Answer 16

Charge

Question 17

What does r stand for?

Answer 17

Separation distance

Question 18

What does m stand for?

Answer 18

Mass

Question 19

What does q stand for?

Answer 19

Charge

Question 20

What does F(g) stand for?

Answer 20

Gravitational Force

Question 21

What does F(e) stand for?

Answer 21

Electric Force

Question 22

What does V(esc) stand for?

Answer 22

Escape Velocity

Question 23

What does V(orbit) stand for?

Answer 23

Velocity of orbit

Question 24

What does W stand for?

Answer 24

Work done

Question 25

What does ΔV stand for?

Answer 25

Change in gravitational potential between two points

Question 26

What does Δr stand for?

Answer 26

Distance between those two points

Question 27

Definition of potential gradient

Answer 27

Slope of a graph which plots the gravitational potential against the distance from the mass

Question 28

Both equations for potential gradient

Answer 28

PG = - ΔV/Δr = GM/r^2

Question 29

Definition of Potential Difference

Answer 29

The work done by moving a positive test charge from one point to another in an electric field. Also called voltage, V.

Question 30

Both equations for potential difference

Answer 30

V = W/Q = E/Q

Question 31

What is Kepler’s third law

Answer 31

The square of a planets period is poroportional to the cube of its mean distance from the sun. T^2 is proportional to R^3

Question 32

Equation for T^2

Answer 32

T^2 = 4 * π^2 / GM R^3

Question 33

What does K stand for?

Answer 33

Kinetic energy

Question 34

Equation for kinetic Energy

Answer 34

Potential divided by 2 and non negative

Question 35

Equation of total energy

Answer 35

Kinetic energy + gravitational potential energy

Question 36

Definition of Photons

Answer 36

Smallest discrete amount of electromagnetic radiation (light).

Question 37

Properties of waves

Answer 37

Exhibit wave properties under refraction or interface and under its emission or absorption.

Question 38

What does E stand for?

Answer 38

Photon’s energy