# Electromagnetic Waves and Induction

1. Jul 2, 2009

### jlmessick88

1. The problem statement, all variables and given/known data

The 2.0-cm-diameter solenoid in the figure passes through the center of a 6.0-cm-diameter loop. The magnetic field inside the solenoid is 0.20 T.
What is the magnetic flux through the loop when it is perpendicular to the solenoid?
Φ1 = Wb

What is the magnetic flux through the loop when it is tilted at a 60 angle?
Φ2 = Wb

http://i63.photobucket.com/albums/h148/jlmessick88/jfk_Figure_25_P08.jpg
2. Relevant equations

Φ = AB cos()

3. The attempt at a solution
???? No idea :(

Thanks

2. Jul 2, 2009

### cepheid

Staff Emeritus
You have the equation for calculating Φ. You have B. You have A. You have θ. What seems to be the trouble?

3. Jul 2, 2009

### jlmessick88

getting confused with what i should be doing with the solenoid and the loop...wouldn't one effect the other or am i supposed to be using both diameters

4. Jul 2, 2009

### cepheid

Staff Emeritus
The question asks what the magnetic flux through the loop is. The loop does not have a magnetic field, so how could it affect the solenoid?

5. Jul 2, 2009

### jlmessick88

oh!!! ok that makes sense...
but for when it's tilted 60 degrees... it would be .01^2 * pi = 3.14*10^-4 *.2T = 6.28*10^-5 * cos(60) = 3.14 * 10^-5...but that's not the correct answer...i don't understand why...

6. Jul 2, 2009

### cepheid

Staff Emeritus
The question asks what the magnetic flux through the loop is. The loop does not have a magnetic field, so how could it affect the solenoid?

EDIT:

7. Jul 2, 2009

### jlmessick88

What is the magnetic flux through the loop when it is perpendicular to the solenoid?
=6.3×10−5
Correct
.01^2 * pi = 3.14*10^-4
3.14*10^-4 *.2 = 6.28*10^-5
6.28*10^-5 * cos(0) = 6.28*10^-5

so for the second part wouldn't i just use cos(60)??

8. Jul 2, 2009

### ideasrule

Yes, you just use flux=BAcos(60). I don't know why you're doing:

.01^2 * pi = 3.14*10^-4
3.14*10^-4 *.2 = 6.28*10^-5
6.28*10^-5 * cos(0) = 6.28*10^-5

9. Jul 3, 2009

### jlmessick88

but when i used BAcos(60), i get 3.14*10^-5, that's wrong...why?!?!

10. Jul 3, 2009

### queenofbabes

Not really seeing why the answer is wrong. What does your book say?

11. Jul 3, 2009

### jlmessick88

i don't know what the answer is...it's just saying it's wrong...

12. Jul 9, 2009

### beccaboo2407

Its the same answer for both.. even though i'm sure this is too late now