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Flashcards in Fields Deck (13):

What is a Gravitational Field?

A field in which a force acts on a mass.


What are field lines?

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


What are equipotential lines?

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


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.


What is a masses gravitational potential?

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


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


What is an electric field

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


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


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


what is a magnetic field?

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


What is magnetic flux?

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


What is magnetic flux density?

this is the magnetic flux per unit area


What is the strength of the magnetic field?

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