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

Induced EMF

  • Thread starter WY
  • Start date
  • #1
WY
28
0
Hey
I'm wondering if someone can help me out with this question.

Q: In order to measure the magnetic fields produced by the power lines carrying 50Hz alternating current, a coil consisting of 1500 turns of area 5cm^2 as constructed. Suppose that there is a single power line carrying a current which has an amplitude of 800A and that the coil is 10m from the wire.
a) What is the magnitude of the magnetic field at the coil
I found this using B =[N(mu_0)I]/2R
b) What is the magnitude of the induced emf in the coil?

I'm stumped on B :confused: could anyone point me in the right direction? I was using the idea that change in flux over time can be used to find induced emf and that in an alternating curret dI/dt=2*pi*f*I - but the problem is that i don't know where to go from there.

Thanks in advance!
 

Answers and Replies

  • #2
mukundpa
Homework Helper
524
3
The magnetic field is not constant.
Write the equation for the current as a function of time.
 
  • #3
WY
28
0
thanks for the quick reply - but i don't quite understand how this ties in with finding the emf using the change in flux over the change in time.
 
  • #4
WY
28
0
oh i see now! sorry - I wasn't thinking properly! Thanks again :)
 

Related Threads for: Induced EMF

  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
18
Views
2K
  • Last Post
Replies
4
Views
4K
  • Last Post
Replies
3
Views
2K
Top