Moving charges and magnetism

  • #1
Suyash Singh

Homework Statement



current in wire is in east to west direction.direction of magneetic field below the line

Homework Equations


right hand thumb rule

The Attempt at a Solution


i used the right hand thumb rule to find the direction of magnetic field but the magnetic field comes out in in the upwards direction(out of plane) but the answer is in the south direction
my answer -upwards
real answer-south

Thankyou
 

Answers and Replies

  • #2
ehild
Homework Helper
15,526
1,901

Homework Statement



current in wire is in east to west direction.direction of magneetic field below the line

Homework Equations


right hand thumb rule

The Attempt at a Solution


i used the right hand thumb rule to find the direction of magnetic field but the magnetic field comes out in in the upwards direction(out of plane) but the answer is in the south direction
my answer -upwards
real answer-south

Thankyou
East to West defines a line, what plane do you speak about?
 
  • #3
cnh1995
Homework Helper
Gold Member
3,422
1,145
in in the upwards direction(out of plane)
Plane of the paper?
I think your answer is right.
 
  • #4
ehild
Homework Helper
15,526
1,901
Plane of the paper?
I think your answer is right.
The paper can be horizontal, vertical, or can stand in any direction.

East, West, North, South are defined in a horizontal plane.
The magnetic field lines are circles around the wire, with the wire as axis. Take a pencil as wire and do the right thumb rule in reality. In what direction do your fingers point under the wire?
This is a very bad drawing, I was not able to make a better one. The wire and the cardinal directions are in the horizontal plane.
upload_2017-7-10_8-38-30.png
 
  • #5
Suyash Singh
East to West defines a line, what plane do you speak about?
the plane of paper since north south east west are in plane of paper.
 
  • #6
Suyash Singh
upload_2017-7-10_13-14-48.png

this is the answer but my fingers are coming out of the plane of paper
like this
Maxwell%20right%20hand%20thumb%20rule_1404724095391.png

and this the actual question
upload_2017-7-10_13-18-44.png

I could get the numerical answer but not the the direction
 
  • #7
ehild
Homework Helper
15,526
1,901
View attachment 206877
this is the answer but my fingers are coming out of the plane of paper
like this
View attachment 206878
and this the actual question
View attachment 206879
I could get the numerical answer but not the the direction
Your fingers come out of the paper beside the wire or above it. Just under the wire the fingers stand in the North-West direction, and having short fingers, the tips would point to the South. The green vector represents the direction of the magnetic field under the wire.
upload_2017-7-10_10-56-7.png


This is a side view:

upload_2017-7-10_11-2-38.png
 

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