You are Here: Home

# Physics electric fields watch

1. 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.
2. (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 )
3. (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

rosie
4. 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.
5. (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?
6. F = Q1.Q2/(4pi."epsilon"r^2)

courtesy of Hoofbeat!
7. 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.
8. omg they are such a bunch of dumb ***** for deletign my posts

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

rosie
10. (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
11. Fields and Forces.doc (36.0 KB, 292 views)
12. (Original post by crana)

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

N(flux ) = BAN
13. (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:

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

rosie
14. 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)
15. (Original post by crana)
erm, ok, but ALL I WANT TO KNOW IS:

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.
16. (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
17. 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?
18. (Original post by crana)
erm, ok, but ALL I WANT TO KNOW IS:

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:

" the amount of flux that is cut " and the magnitude of the induced emf is in proportion to this
19. (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)"
20. (Original post by DazYaa911)
in my physics 2 book it says specifically:

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

" 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

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: June 15, 2004
Today on TSR

### Uni league tables

Do they actually matter?

### University open days

• Staffordshire University
Everything except: Midwifery, Operating Department Practice, Paramedic Undergraduate
Sun, 21 Oct '18
• University of Exeter
Wed, 24 Oct '18