$A$ solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increase or decrease? Explain.
(B) When an iron core is inserted into the solenoid, the magnetic permeability of the core increases significantly compared to air.
This leads to an increase in the magnetic field $(B)$ and consequently the magnetic flux $(\Phi)$ linked with the solenoid.
According to Lenz's law, the induced electromotive force $(emf)$ will oppose this change in magnetic flux.
To oppose the increase in magnetic flux, the solenoid induces a back $emf$ that acts against the battery voltage.
As a result, the net current flowing through the solenoid decreases.
This leads to an increase in the magnetic field $(B)$ and consequently the magnetic flux $(\Phi)$ linked with the solenoid.
According to Lenz's law, the induced electromotive force $(emf)$ will oppose this change in magnetic flux.
To oppose the increase in magnetic flux, the solenoid induces a back $emf$ that acts against the battery voltage.
As a result, the net current flowing through the solenoid decreases.
Explore More
Similar Questions
$A$ long solenoid has $1000$ turns. When a current of $4\, A$ flows through it,the magnetic flux linked with each turn of the solenoid is $4 \times 10^{-3}\, Wb$. The self-inductance of the solenoid is......$H$
MediumNEET 2016
View SolutionThe current in a coil of inductance $0.2 \,H$ changes from $5 \,A$ to $2 \,A$ in $0.5 \,s$. The magnitude of the average induced emf in the coil is (in $\,V$)
MediumKCET 2020
View SolutionTwo coils have self-inductance $L_1 = 4 \, mH$ and $L_2 = 1 \, mH$ respectively. The currents in the two coils are increased at the same rate. At a certain instant of time,both coils are given the same power. If $I_1$ and $I_2$ are the currents in the two coils at that instant of time respectively,then the value of $\frac{I_1}{I_2}$ is:
Medium
View SolutionThe self-inductance of a coil is $50 mH$. When a current of $1 A$ passing through the coil reduces to zero at a steady rate in $0.1 s$,find the self-induced emf. (in $V$)
$A$ current $I$ produces a magnetic flux $\phi$ per turn in a coil of $n$ turns. The self-inductance of the coil is $L$. The relation between them is:
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo