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

A coil with turns given magnetic field, time find the emf induced in the coil

  • Thread starter sonrie
  • Start date
35
0
A coil with 240 turns enclosing an area of 13.7 cm^2 is rotated in a time interval of 3.70×10^-2 s from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The earth's magnetic field at the lab location is 5.9×10−5 T .

What is the total magnetic flux through the coil before it is rotated?
I found this answer its 1.9*10^-5 WB.

What is the total magnetic flux through the coil after it is rotated?
I found this answer its 0 WB.

What is the average emf induced in the coil?

I'm having trouble getting the right answer! I get 1.27*10^-7 but its wrong! Help Please!
 

Doc Al

Mentor
44,797
1,052
What is the total magnetic flux through the coil before it is rotated?
I found this answer its 1.9*10^-5 WB.
Double check the exponents in this answer.

What is the total magnetic flux through the coil after it is rotated?
I found this answer its 0 WB.
Good.

What is the average emf induced in the coil?

I'm having trouble getting the right answer! I get 1.27*10^-7 but its wrong!
How did you get this?
 
35
0
the equation is emf = -N BA/T

-240 5.9*10^-5*.137/5.9*10^-5=3.28*10^-9 its still wrong
 

Doc Al

Mentor
44,797
1,052
the equation is emf = -N BA/T

-240 5.9*10^-5*.137/5.9*10^-5=3.28*10^-9 its still wrong
You have the correct formula, but you need to redo the calculation more carefully:
(1) You have the incorrect area. (Note that 1 cm^2 [itex]= 10^{-4}[/itex] m^2.)
(2) Divide by the time interval.
 
35
0
Thank you!
 

Related Threads for: A coil with turns given magnetic field, time find the emf induced in the coil

Replies
1
Views
8K
Replies
15
Views
2K
Replies
0
Views
6K
Replies
6
Views
78K
  • Posted
Replies
6
Views
6K
Replies
1
Views
2K
Replies
1
Views
473
  • Posted
Replies
1
Views
4K

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