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

Magnetic flux and induction help

  • #1
1,444
0
[itex]epsilon=-\frac{d \Phi}{dt}[/itex] where epsilon is the emf. the emf produces a current in the oppostite direction to the loop which gives a magnetic field opposing ther external field B. my notes then say

[itex]\frac{d \Phi}{dt}>0 \Rightarrow \frac{d \Phi_{Induced}}{dt}<0[/itex] but i don't understand this statement, can someone explain it please?
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5


Changing magnetic flux produces the changing current in the loop. This changing current produces changing magnetic flux which links the loop resulting changing induces magnetic flux in the opposite direction. One is taken as positive and the other is taken as negative.
 
  • #3
1,444
0


sorry what?

is it basically lenz's law yeah?

the changing magnetic flux causes an electric field round the wire which induces a current round the loop, this current is changing with time and in turn produces a changing magnetic field in the oppostie direction to the original external field and so the induced flux has the opposite sign to the flux of the external field?
 

Related Threads for: Magnetic flux and induction help

Replies
0
Views
2K
  • Last Post
Replies
3
Views
2K
Replies
0
Views
4K
  • Last Post
Replies
13
Views
3K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
7
Views
1K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
5K
Top