Answered

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The voltage can be induced in the solenoid without any (electric) source like the battery. All because of the:
A. Changes of the electric field in time in that solenoid;
B. Changes of the magnetic field in time in that solenoid;
C. Changes of potential difference at the ends of the solenoid thanks to the capacitor in the circuit;
D. Changes of the gravity field which surrounds the solenoid.

Sagot :

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