• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Magnetic Field in polarisation ?

  • Thread starter mkbh_10
  • Start date
222
0
Why is only electric field considered when we discuss the phenomenon of polarisation ? What about the magnetic field ?
 

lanedance

Homework Helper
3,304
2
i assume you are talking about light?

magnetic field as always perp to the electric, so will be polarised in the same manner but rotated 90deg
 
222
0
i think its because the direction of magnetic field is helical whereas the electric field is straight .
 

lanedance

Homework Helper
3,304
2
ahhh... no the magnetic polarisation will be the same as the electric

ie linearly polarised light has both linearly polarised eletric & magnetic fields, both at 90deg to teh directino of propogation & to each other

similarly cicularly polarised light has both cicularly polarised eletric & magnetic fields, still both at 90deg to the direction of propogation & to each other

try finding the equation for a plane wave and check it out
 
222
0
I am not saying that the polarised light will not have magnetic field , it will have it but genreally in polarisation we don't talk abt the mag field & i think the reason i gave must be it .
 

lanedance

Homework Helper
3,304
2
for linearly polarised light the magnetic field will be lineraly polarised not helical, so that reason is not correct

have a look here
http://en.wikipedia.org/wiki/Electromagnetic_radiation

if you want to get into the philosophical side of things then we probably usually talk about electric field as the relative strength is B = E/c. So in terms of interacting with things the electric part is probably more significant.
 

Related Threads for: Magnetic Field in polarisation ?

Replies
7
Views
891
Replies
1
Views
904
  • Posted
Replies
1
Views
904
  • Posted
Replies
3
Views
2K
Replies
1
Views
2K
Replies
1
Views
2K
Replies
2
Views
1K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top