Question

when the ends of a wire are connected to a battery initially the current is slightly larger and soon it decreases and becomes steady at a lower value although the emf of the battery remain unchanged
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Answer 1

Answer:

The current will decrease. This is because on inserting an iron core in the

solenoid, the magnetic field increases and hence magnetic flux linked with the solenoid increases. As per Lenzs law, the emf induced in the solenoid will oppose this increase, which can be achieved by a decrease in Current.