Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.
When key K is open , the coil 1 is disconnected from the battary. The needle momentarily moves, but to the oppsidte side. It means that now the current flows in the opposite in coil 2. This happens due to an external magnetic field passing through the loop decreases.
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