Eliminate Lenz's current

[vineet_kiran]

Eliminate Lenz's current by varying number of turns.

[teslaalset]

Eliminate Lenz's current by varying number of turns.

If you're trying to propose OU with this idea, then you should keep in mind that it takes energy to push the windings together.
It's the total energy balance which should be kept in mind.

Nice puzzle though

[broli]

I suggest you read this thread:

http://www.energeticforum.com/renewable-energy/7113-spark-gap-step-down-transformer-ou.html

It has many case studies on what happens to flux, energy and other paremeters when one or more parameters of an inductor are changed.

In your case you decrease the windings, this will cause the current to increase proportionally, however in the energy equation both are squared so the total energy remains unchanged. Besides that you are also changing the length, decreasing length usually means a loss of inductive energy, as the windings naturally attract each other, so what you lose inductivly you have gained mechanically.

[Airstriker]

In your case you decrease the windings, this will cause the current to increase proportionally, however in the energy equation both are squared so the total energy remains unchanged. Besides that you are also changing the length, decreasing length usually means a loss of inductive energy, as the windings naturally attract each other, so what you lose inductivly you have gained mechanically.

Why the current should increase ? It shouldn't, as the total wire resistance is untouched. You're not removing a piece of wire from equation; you're just making a short circuit from the windings. Note, that the wire is not isolated.

[broli]

Why the current should increase ? It shouldn't, as the total wire resistance is untouched. You're not removing a piece of wire from equation; you're just making a short circuit from the windings. Note, that the wire is not isolated.

The current increases due to flux conservation, when you short out the wires you are essentially creating one big loop of said current, this is not enough to maintain the already established flux due to the, previously, many loops. So the current will shoot up in order to maintain the existing flux.