(D) Lenz's law states that the direction of the induced $emf$ is always such that it opposes the change in magnetic flux that produces it.This law is

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(D) Lenz's law states that the direction of the induced $emf$ is always such that it opposes the change in magnetic flux that produces it.This law is a direct consequence of the law of conservation of energy.If the induced $emf$ were to assist the change in flux,it would lead to an increase in energy without any external work,which is impossible.Therefore,the Assertion is incorrect,and the Reason is correct.

Class 12 Physics Electromagnetic Induction Faraday's and Lenz's Law

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Assertion : Lenz's law violates the principle of conservation of energy.
Reason : Induced $emf$ always opposes the change in magnetic flux responsible for its production.

AIIMS 2014 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Electromagnetic Induction

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Faraday's and Lenz's Law

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The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field $B.$ The direction of induced current in the case $II$ is

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$A$ uniform magnetic field is restricted within a region of radius $r$. The magnetic field changes with time at a rate $\frac{d\vec{B}}{dt}$. Loop $1$ of radius $R > r$ encloses the region,and loop $2$ of radius $R$ is outside the region of the magnetic field as shown in the figure. Then the $e.m.f.$ generated is:

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An aluminium ring $B$ faces an electromagnet $A$. The current $I$ through $A$ can be altered.

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$A$ coil with an area of $500 \ cm^2$ and $1000$ turns is placed in a magnetic field of $2 \times 10^{-5} \ Wb/m^2$ perpendicular to its plane. If the coil is rotated by $180^o$ in $0.2 \ s$,the induced $emf$ in $milli-volts$ is:

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Lenz's law is expressed by the following formula (here $e$ = induced $e.m.f.$,$\phi$ = magnetic flux in one turn and $N$ = number of turns).

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Assertion : Lenz's law violates the principle of conservation of energy.Reason : Induced $emf$ always opposes the change in magnetic flux responsible for its production.

Similar Questions

The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field $B.$ The direction of induced current in the case $II$ is

An aluminium ring $B$ faces an electromagnet $A$. The current $I$ through $A$ can be altered.

$A$ coil with an area of $500 \ cm^2$ and $1000$ turns is placed in a magnetic field of $2 \times 10^{-5} \ Wb/m^2$ perpendicular to its plane. If the coil is rotated by $180^o$ in $0.2 \ s$,the induced $emf$ in $milli-volts$ is:

Lenz's law is expressed by the following formula (here $e$ = induced $e.m.f.$,$\phi$ = magnetic flux in one turn and $N$ = number of turns).

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Assertion : Lenz's law violates the principle of conservation of energy.
Reason : Induced $emf$ always opposes the change in magnetic flux responsible for its production.