Magnetic Force and Work

  • Thread starter Sukuya
  • Start date
  • #1
Sukuya
5
0
Two long parallel wires carrying current I attract each other. Let's say we let them free to move then they will accelerate towards each other, thereby increasing the kinetic energy of the wires. But we know that magnetic forces can't do work on a system. Then how can magnetic force increase kinetic energy in this case.
 

Answers and Replies

  • #2
UltrafastPED
Science Advisor
Gold Member
1,912
216
It's the currents doing the work ... it's more obvious when you are lifting scrap metal with an electromagnet - then you can see the load on the generator.

You often need to do a careful analysis. See this old thread for a lengthy discussion:
https://www.physicsforums.com/showthread.php?t=229056
 

Suggested for: Magnetic Force and Work

  • Last Post
Replies
6
Views
5K
  • Last Post
Replies
10
Views
576
  • Last Post
Replies
5
Views
1K
  • Last Post
3
Replies
73
Views
44K
  • Last Post
Replies
5
Views
2K
  • Last Post
2
Replies
48
Views
8K
  • Last Post
Replies
11
Views
3K
Replies
12
Views
2K
Replies
3
Views
2K
  • Last Post
Replies
7
Views
3K
Top