# Lenz's Law and multiple tubes

## Main Question or Discussion Point

Obviously if a magnet falls down a conducting tube, it induces a current in the tube. But what if you surrounded the tube with other identical tubes in parallel with the first one so that they're touching, and then wrapped wire around those other tubes? Would the current induced in the wrapped wire be of the same magnitude as the current induced in the central tube? Or would the induced current in the wire be as if the tubes weren't there, and the magnet was just falling down the solenoid of wire?

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mfb
Mentor
Where is the difference between this setup and just a thicker tube?

You mean a single tube with an inner diameter the same as the inner tube, and an outer radius the same as the wrapped wire?

mfb
Mentor
That's how I interpreted your description.

The tube will do a good job in shielding changes in field via the induced currents, so the effect on the coil could be small.

That may very well be an apt way of looking at it. And if that is the case, how would that affect the velocity of the magnet?