An example of the phenomenon of self-induction is the experiment with two light bulbs connected in parallel through a switch to a current source, one of which is connected through a coil (Fig. 27). When the key is closed, light 2, turned on through the coil, lights up later than light 1. This is because after the key is closed, the current does not reach its maximum value immediately, the magnetic field of the increasing current will generate an induction EMF in the coil, which, in accordance with Lenz’s rule, will interfere with the increase in current.
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