Which specific instrument did Michael Faraday use to observe the current in his secondary coil?
Answer
A galvanometer
Faraday connected the secondary coil to a galvanometer, which is an instrument specifically designed to detect and measure weak electric currents. The needle of the galvanometer provided visual evidence of the transient current by twitching when the primary circuit was either closed or opened, thereby confirming the existence of electromagnetic induction.
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