Push a magnet in and out of a coil and a current appears from nowhere, with no battery at all. This is how a bike dynamo and every power-station generator make electricity. The needle only moves while the magnet is moving: it is the change that counts. Make the needle swing all the way to the target mark.
MissionMake the peak swing reach the target mark (50).Round 1Streak 0Best 0
Will the peak swing reach the target?
The magnet keeps moving on its own. Set the controls, predict, then take the reading.
peak reading (relative)?
target mark50
magnet nowmoving
A bigger reading comes from: more turns, a stronger magnet, and faster movement. Hold the magnet still and the reading drops to zero.