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

Faraday's Law of Induction and Current

  • Thread starter Kandycat
  • Start date
22
0
1. Homework Statement

A 22.0-cm-diameter coil consists of 20 turns of circular copper wire of 2.6 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 8.65 x 10-3 T/s. Determine (a) the current in the loop, and (b) the rate at which thermal energy is produced.

2. Homework Equations
V = NBA / t
R= pl/A

l = N*2*pi*diameter of coil
A = pi*(radius of wire)2

I = V/R

3. The Attempt at a Solution

I understand the part (a)... sort of. Tell me if I did it something wrong.

V = NBA / t
V = (20)(8.65 x 10-3 T/s)(pi*(.0013 m)2) = 9.19 x 10-3 V

R = pl/A
R = (1.72 x 10-8)(20*2*pi*.22 m)/ (pi*(.0013 m)2) = 8.96 x 10-2 ohms

I = V/R
I = 9.19 x 10-3 V / 8.96 x 10-2 ohms = 1.03 x 10-5 A

Part (b) I don't understand. I don't know what I'm finding.
 

rl.bhat

Homework Helper
4,433
5
the rate at which thermal energy is produced.
It is power and is found by P=I^2*R.
 

Related Threads for: Faraday's Law of Induction and Current

Replies
9
Views
1K
  • Posted
Replies
4
Views
2K
  • Posted
Replies
11
Views
3K
  • Posted
Replies
2
Views
3K
  • Posted
Replies
4
Views
788
  • Posted
Replies
1
Views
1K
Replies
4
Views
6K
Replies
1
Views
5K

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