Karteikarten
Physics- Electric fields
Karten in diesem Stapel (39)
- 1Where does an electric field form?Around a charged Object
- 2What is charge measured in?Coulombs- it can be positive or negative
- 3Oppositely charged particles...attract
- 4Like charges ...Repel
- 5When a charged object is placed in an electric field ...It will experience a force
- 6What does Coulombs Law calculate?The force of attraction or repulsion between two point charges in a vacuum
- 7What is the value of 'epsilon-nought'8.85x10^-12
- 8The force on Q1 is always...Equal and opposite to the force on Q2
- 9What does the direction depend on?The charges
- 10When the charges are opposite so the force is attractive what will F be?Negative
- 11If the charges are alike and the force is repulsive what will F be?Positive
- 12What type of Law is coulombs Law?An inverse square law
- 13When the charges are further apart what happens to the force between them?The force becomes weaker
- 14What does F also depend on?The permittivity of the material
- 15What is Electric field strength defined as?The force Per unit of positive charge
- 16What are the units for Electric field strength?NC^-1
- 17What type of quantity is Electric field strength?Vector- pointing in the direction that a positive charge would move
- 18What type of field does a point charge have?A radial field
- 19In a radial field what is E inversely proportional to?r^2
- 20If the test charge is positive and Q is also positive where would the field lines point?Point away from the test charge
- 21If the test charge is negative and Q is positive where would the field lines point?Point towards the test charge
- 22What does field strength do as you go further away from Q? How can you tell this on a diagram?It decreases
The field lines get further apart - 23In a uniform field what is E inversely proportional to?D- the distance between the plates
- 24In a uniform field the field lines are...Parallel to each other
- 25In a uniform field how does field strength differ?It is the same at all points between the two plates
- 26What is electric potential?Potential energy per Unit of charge
- 27What does the electric potential of a point depend on?How far it is from the charge and the size of the charge
- 28When the force is repulsive V (Electric potential) is...Positive
- 29When the force is attractive V (Electric potential) is...Negative
- 30What is electric potential difference?The energy needed to move a unit of charge
- 31To move a charge across a potential difference what do you need?To use energy (The work done)
- 32What does the work done depend on?The size of the charge your moving and the potential difference you are moving it across
- 33What is a similarity between Gravitational and Electric fields?g= force per unit of mass
E= force per unit of positive charge - 34What is another similarity between Gravitational and Electric fields?Newtons law of gravitation is an inverse square law
Coulombs law is also an inverse square law - 35What is another similarity between Gravitational and Electric fields?The field line for a point mass and negative point charge are the same
- 36What is another similarity between Gravitational and Electric fields?Gravitational potential 'V' is potential energy per unit of mass and zero at infinity
Electric Potential 'V' is potential energy per unit of positive charge and is zero at infinty - 37What is a difference of Gravitational and electric fields?Gravitational forces are always attractive
Electric forces can either be attractive or repulsive - 38What is another difference of Gravitational and electric fields?Objects can be shielded from electric fields but not from gravitational fields
- 39What is another difference of Gravitational and Electric fields?The size of an electric force depends on the medium between the charges
For Gravitational forces this makes no difference
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- Physics Unit 4 Karteikarten am Physics- Electric fields, erstellt von sammy414 am 27/11/2013.
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- sammy414
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