INTRODUCTION TO FIELDS Flashcards
How many types of fields are there? name them
There are 3 types of fields
+ magnetic fields
+ electric fields
+ gravitational fields
state a property of every magnet
Every magnet has a magnetic field
describe what happens to a magnetic material in a magnetic field
In a magnetic field any magnetic material will experience a force
explain why wood won’t experience a force in a magnetic field
Wood is not a magnetic material therefore it won’t experience any force in a magnetic field
what makes an electric field?
Any object with an electric charge has an electric field
name at least 3 things that have an electric field
proton (+)
electron (-)
anti neutrino (-)
if an object has a net positive or…
net negative charge then it has an electric field.
what happens if an object has a net charge of 0?
The object won’t have an electric field as it has no charge, hence it won’t experience a force in an electric field
what will experience a force in an electric field?
Any object with a charge will experience a force
What makes a gravitational field?
Anything with mass has a gravitational field
what will experience a force in a gravitational field?
Any object with mass will experience a force in a gravitational field
What is a field?
A field is a region of space where an object experiences a non-contact force
what is the range of gravitational and electric and magnetic fields?
The range of gravitational, electric and magnetic fields are all infinite
name 2 things field line diagrams show
direction and magnitude
gravitational field lines show…
the direction that any mass would experience a force
magnetic field lines show…
The direction that the north pole would experience a force
electric field lines show…
electric field lines show the direction that a positive charge would experience a force
why do field lines never cross?
that means the object experiences a force in 2 directions at the same time
what is field line density?
How closely packed the field lines are
state the relationship between field line density and field strength
Field strength and field line density are directly proportional
state the relationship between field line density and force
directly proportional.
The greater the field line density, the greater the force.
in a uniform field the magnitude…
of the force on an object is constant throughout the field. We can say the field strength is uniform
state the conditions for a uniform field
where field lines are straight, parallel, evenly spaced and all point in the same direction.
ONLY UNIFORM IF ALL 4 CONDITIONS ARE TRUE
state a property of a uniform field
The direction of a force on an object is constant anywhere in the field
in a uniform field the field line density
is constant throughout
state the conditions for a radial field
field lines are straight, spread out equally and meet in the centre
what happens to the field strength as we move further away from the object in a radial field
the field strength decreases because as we move further away from the object the field lines become less dense.
in a radial field the direction of the force…
acts either towards or away from the centre
