Many of you mistakenly invoked Faraday induction ( or the form of it known as Lenz Law) in this lab. This is very wrong. The current in the solenoid was produced by the voltage difference across the solenoid which in turn was caused by connecting it to a battery. The chemicals in the battery produce the voltage difference between the terminals which when connected to the solenoid cause the current to flow. Note that only one solenoid was connected. The second solenoid was used only as dead weight to come close to balancing the first solenoid.
Faraday induction and Lenz Law both involve changing magnetic fields, i.e. fields that vary with strength or direction as time goes by. A constant field produces no EMF and thus no current. The permanent magnet was being held relatively still and thus was not capable of inducing much current. Make sure you understand this!
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