Fasten the two cored solenoid coils to a common base. Connect one coil through a rheostat to a DC source and the other to a milliammeter. When closing and opening the key, observe the deviations of the milliammeter needle »Write down the answers to the following questions
a) At what moments in the second coil an induction current occurs
b) Why does this experience illustrate how the transformer works?
a) A current occurs in the second coil when the first coil is closed or opened.
b) When the current in the first coil changes, the magnetic flux penetrating both coils also changes. Changing the magnetic flux through the second coil leads to the appearance of an induction current in it.
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