Increase in kinetic energy in current carrying conductor

AI Thread Summary
The discussion centers on the increase in kinetic energy of two current-carrying conductors moving towards each other. It is established that magnetic forces do not perform work, prompting questions about whether external factors are responsible for the work done. A participant argues that magnetic forces can indeed do work, suggesting that the focus should be on understanding how this occurs. The right-hand rules are mentioned as a helpful tool for understanding the interactions between magnetic fields and currents. The conversation emphasizes the importance of accurately interpreting the role of magnetic forces in this context.
carlyn medona

Homework Statement


If I have two current carrying conductor carrying current is same direction, they move towards each other so kinetiisc energy increases. So which force does work here?

Homework Equations

The Attempt at a Solution


I know magnetic force can't do work, is work done by some external factor ?
 
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carlyn medona said:
I know magnetic force can't do work ...
How do you know that? If that's the case, how do you explain a pin jumping off a table top and sticking to a refrigerator magnet hovering above it? Be careful with how you generalize what.
 
carlyn medona said:
I know magnetic force can't do work, is work done by some external factor ?
Kuruman is correct. I'm going to let you in on the secret... it does do work. The question you should be asking is how it does work.

The right hand rules should help you out. If you do not understand what those are, take a look at this pdf from a physics textbook: http://fcis.aisdhaka.org/personal/chendricks/IB/Giancoli/Giancoli Ch 20 Magnetism.pdf

Look at Page 9, it should have a summary of the ways magnetic fields and currents interact.
 
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