STANDARDPhysics-Electromagnetic Induction
STANDARD Physics Lenz's Law MCQ Question
Type: MCQ-conceptual-Medium-Class 12
When an iron core is inserted into the solenoid, the current will
A
increase
B
decrease
C
remains same
D
first increase then decrease
Correct Answer
Option B
Detailed Explanation
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 Lenz's law, the emf induced in the solenoid will oppose this increase, which can be achieved by a decrease in current.
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