State and explain Lenz's law - Vidyadip

Question

State and explain Lenz's law

✓

Answer

• Lenz's law :
→"The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it."

→In experiment of coil and magnet, keeping N -pole of magnet facing coil and moving magnet towards coil, magnetic flux linked with coil increases. As a result, electric current is induced in it.
→According to Lenz's law, this induced electric current is in such direction that it opposes increase in flux.
→This is possible only when end of coil towards magnet acts as N -pole and induced current flow in anti-clockwise direction, as shown in figure (a).
→In the same manner, as shown in figure (b), on taking N -pole of magnet away from coil, magnetic flux linked with coil decreases. As a result induced electric current flows in clockwise directions.
→The induced current is in such a direction that end of coil towards magnet behaves as S-pole.
→Thus, on changing magnetic flux linked with coil, induced current (and induced emf) is produced in such a direction that it opposes the change in magnetic flux.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from ELECTROMAGNETIC INDUCTION→ELECTROMAGNETIC INDUCTION — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

A wooden block of mass $0.5\ kg$ and density $800\ kg/m^3 $ is fastened to the free end of a vertical spring of spring constant $50N/m$ fixed at the bottom. If the entire system is completely immersed in water, find.

The elongation $($or compression$)$ of the spring in equilibrium and.
The time $-$ period of vertical oscillations of the block when it is slightly depressed and released.

Two protons and two electrons are hanging freely at equal distances. Compare the repulsion force between proton and electron.

Two electric bulbs $P$ and $Q$ have their resistances in the ratio of $1 : 2.$ They are connected in series across a battery. Find the ratio of the power dissipation in these bulbs.

Explain why cooking is faster in a pressure cooker.

What is electron emission ? Explain its types.

A tunnel is dug along a diameter of the earth. Find the force on a particle of mass m placed in the tunnel at a distance x from the centre.

(a) An em wave is travelling in a medium with a velocity $\vec{v}=v\hat{i}$. Draw a sketch showing the propagation of the em wave, indicating the direction of oscillating electric and magnetic fields. (b) How are the magnitudes of the electric and magnetic fields related to the velocity of em wave.

Find the electric force between two protons separated by a distance of $1$ fermi $(1$ fermi $= 10^{-15}\ m).$ The protons in a nucleus remain at a separation of this order.

The peak voltage of an ac supply is $300V$. What is the rms voltage?
The rms value of current in an ac circuit is $10A$. What is the peak current?

Answer the following questions: The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual imae produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnification?