Fields Flashcards Preview

A-level Physics > Fields > Flashcards

Flashcards in Fields Deck (13):
1

What is a Gravitational Field?

A field in which a force acts on a mass.

2

What are field lines?

they are lines that show the gravitational field and they always point towards the centre of mass of the object.

3

What are equipotential lines?

a point on this lines feels the same strength of the gravitational field.

4

What is Newton's Gravitational law?

This law states that a particle attracts every other particle in the universe using a force that is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.

5

What is a masses gravitational potential?

this is the potential energy a unit mass would have at a specific point int he field.

6

What is a geostationary orbit?

-the satellite stays at a fixed point around the earth
-the satellite has the same period as the earth
- useful for tv satellites and communications

7

What is an electric field

an electric field is a region in which a charged particle feels a force

8

What is coulomb's law?

It states like charges repel and opposite charges attract, with a force proportional to the product of the charges and inversely proportional to the square of the distance between them

9

What happens if you throw an electron into a uniform field?

-the electron experiences a constant vertical force- eg projectile motion
-constant horizontal velocity
- constant vertical acceleration

10

what is a magnetic field?

this is a region in which a magnetic material or moving charge feels a force

11

What is magnetic flux?

this is a measure of the strength of a magnetic field over a given area perpendicular to it

12

What is magnetic flux density?

this is the magnetic flux per unit area

13

What is the strength of the magnetic field?

the force per unit ( current times length) perpendicular to the field.