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

Electromagnetic waves - antennas

  • Thread starter evan4888
  • Start date
I just need a little direction to get started on this problem.


A magnetic dipole is uded to detect an electromagnetic wave. The antenna is a coil of 50 turns with radius 5.0 cm. The EM wave has frequency 870 kHz, electric field amplitude 0.50 V/m, and magnetic field amplitude 1.7 x 10^-9 T.

What is the amplitude of the induced emf in the coil?
 

dextercioby

Science Advisor
Homework Helper
Insights Author
12,944
525
I think you might need a review of the Faraday's electromagnetic induction law.

Daniel.
 
I will need a little more guidance than that. I am thinking that I need to find the emf, but I am not sure how I could do that with out a variable of time.

Or would I just use the equation:

[tex] \varepsilon_m = N \omega A B [/tex]
 
Last edited:

dextercioby

Science Advisor
Homework Helper
Insights Author
12,944
525
That's the right equation indeed and it follows really nicely, if you apply Faraday's law correctly and assume, for simplicity a cosinusoidal time dependence of the magnetic induction.

Daniel.
 

Related Threads for: Electromagnetic waves - antennas

Replies
25
Views
10K
Replies
1
Views
819
Replies
1
Views
8K
  • Posted
Replies
1
Views
784
  • Posted
Replies
3
Views
448

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