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    anyone willing to write down the key points electric fields/ write notes on it. I would except i'm lazy

    seriously though, any notes or practice questions would be warmly welcomed.

    (Original post by jonas123)
    anyone willing to write down the key points electric fields/ write notes on it. I would except i'm lazy

    seriously though, any notes or practice questions would be warmly welcomed.
    they flow out of positive and into negative

    E = F / Q

    E = V / D

    Fd = QV


    lines closer together represent a stronger field

    if you are drawing field lines, give the direction ( arrow )

    (Original post by jonas123)
    anyone willing to write down the key points electric fields/ write notes on it. I would except i'm lazy

    seriously though, any notes or practice questions would be warmly welcomed.
    sure
    what is your email address (pm me if you want)

    rosie
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    how about the relationship of forces with distance.

    I think i'm right in saying that the electric force is a 1/r^2 relationship.

    but i'm sure there is some relationship that is 1/r like the force at a distance r from a wire or something.

    (Original post by jonas123)
    how about the relationship of forces with distance.

    I think i'm right in saying that the electric force is a 1/r^2 relationship.

    but i'm sure there is some relationship that is 1/r like the force at a distance r from a wire or something.
    Magnetic field strength near a long wire = (mu 0) I / 2pi r

    that the one?
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    F = Q1.Q2/(4pi."epsilon"r^2)

    courtesy of Hoofbeat!
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    yup crana i think it is.

    i don't want to get confused in the exam in case they have graphs and you have say what it represents.

    omg they are such a bunch of dumb ***** for deletign my posts

    flux linkage is the magnetic flux linking the coil

    (Original post by DazYaa911)
    omg they are such a bunch of dumb ***** for deletign my posts

    flux linkage is the magnetic flux linking the coil
    but what do you mean by "linking" please?

    rosie
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    (Original post by jonas123)
    anyone willing to write down the key points electric fields/ write notes on it. I would except i'm lazy

    seriously though, any notes or practice questions would be warmly welcomed.
    Here you lazy sod

    Though you'll have to draw on diagrams yourself.
    Attached Files
  1. File Type: doc Fields and Forces.doc (36.0 KB, 286 views)

    (Original post by crana)
    but what do you mean by "linking" please?

    rosie
    the amount of flux that is cut and the magnitude of the induced emf is in proportion to this


    N(flux ) = BAN

    (Original post by DazYaa911)
    the amount of flux that is cut and the magnitude of the induced emf is in proportion to this


    N(flux ) = BAN
    erm, ok, but ALL I WANT TO KNOW IS:

    What does "LINKING" actually mean???

    Other facts about flux I can cope with! Please someone just tell me this ONE THING!

    rosie
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    i'm not THAT lazy :P

    thx for the notes crana and everyone else...

    another question, it was on a past paper. There are 2 long wires xcm apart. The current in wire 1 is moving up and the force on wire 2 is to the right (so two long wires, wire 1 on the left, wire 2 on the right). The current in wire 1 is I and the current in wire 2 is 2I.

    Which way is the current in wire 2 going? (ie up or down)

    Which way is the force on wire 1acting? (ie left or right)

    What is the ratio of the force on wire 1 and wire 2? (wire1:wire2)
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    (Original post by crana)
    erm, ok, but ALL I WANT TO KNOW IS:

    What does "LINKING" actually mean???

    Other facts about flux I can cope with! Please someone just tell me this ONE THING!

    rosie
    Linking means a connection between the circuit and the magnetic flux, it's the capacity for interplay between magnetic flux and coil. Only useful in electromagnetic induction.

    The actually basis of the idea is still fuzzy in my head. I'm afraid.

    (Original post by jonas123)
    i'm not THAT lazy :P

    thx for the notes crana and everyone else...

    another question, it was on a past paper. There are 2 long wires xcm apart. The current in wire 1 is moving up and the force on wire 2 is to the right (so two long wires, wire 1 on the left, wire 2 on the right). The current in wire 1 is I and the current in wire 2 is 2I.

    Which way is the current in wire 2 going? (ie up or down)

    Which way is the force on wire 1acting? (ie left or right)

    What is the ratio of the force on wire 1 and wire 2? (wire1:wire2)
    Since they are repelling, the current in wire 2 is down (opp.direction)

    the force on 1 is equal & opposite to force on 2, so left, and the ratio is 1:1

    rosie
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    but how do you know they are repelling?

    do you not have to use one of the 'hand' rules to work out the direction of current?

    (Original post by crana)
    erm, ok, but ALL I WANT TO KNOW IS:

    What does "LINKING" actually mean???

    Other facts about flux I can cope with! Please someone just tell me this ONE THING!

    rosie
    in my physics 2 book it says specifically:
    FLUX LINKING :

    " the amount of flux that is cut " and the magnitude of the induced emf is in proportion to this

    (Original post by Mysticmin)
    Linking means a connection between the circuit and the magnetic flux, it's the capacity for interplay between magnetic flux and coil. Only useful in electromagnetic induction.

    The actually basis of the idea is still fuzzy in my head. I'm afraid.
    so do you reckon itis sort of the same as:

    "The coil is linked to the flux"

    "The coil has the potential to be cut by the flux (like when the magnet moves in and out of the coil/magnetic field grows and shrinks, is what i mean by potential)"

    (Original post by DazYaa911)
    in my physics 2 book it says specifically:
    FLUX LINKING :

    " the amount of flux that is cut " and the magnitude of the induced emf is in proportion to this
    ok
    thanks
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    (Original post by DazYaa911)
    in my physics 2 book it says specifically:
    FLUX LINKING :

    " the amount of flux that is cut " and the magnitude of the induced emf is in proportion to this
    yeah thats wot we got taught
 
 
 
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