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State Lenz’s law. - Physics

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प्रश्न

State Lenz’s law.

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उत्तर

Lenz’s law states that the direction of the induced current is such that it always opposes the cause responsible for its production.

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अध्याय 4: Electromagnetic Induction And Alternating Current - Evaluation [पृष्ठ २६०]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 12 TN Board
अध्याय 4 Electromagnetic Induction And Alternating Current
Evaluation | Q II. 3. | पृष्ठ २६०

संबंधित प्रश्न

When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right. 

 

() What is the name of the effect being produced by the moving magnet?
(2) State what happens to the reading shown on the galvanometer when the magnet is moving away from the coil.
(3) The original experiment is repeated. This time the magnet is moved towards the coil at a great speed. State two changes you would notice in the reading on the galvanometer.


How is the working of an electric bell affected, if alternating current be used instead of direct current?


A light metal disc on the top of an electromagnet is thrown up as the current is switched on. Why? Give reason.


Draw a labelled diagram to show how an electromagnet is made.


List two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed.


Obtain an expression for motional emf from Lorentz force.


A square coil of side 30 cm with 500 turns is kept in a uniform magnetic field of 0.4 T. The plane of the coil is inclined at an angle of 30° to the field. Calculate the magnetic flux through the coil.


A conducting bar of length L is free to slide on two parallel conducting rails as shown in the figure

Two resistors R1 and R2 are connected across the ends of the rails. There is a uniform magnetic field `vec"B"` pointing into the page. An external agent pulls the bar to the left at a constant speed v. The correct statement about the directions of induced currents I1 and I2 flowing through R1 and R2 respectively is:


A current I = 10 sin(100π t) A is passed in first coil, which induces a maximum e.m.f of 5π volt in second coil. The mutual inductance between the coils is ______.


The primary of a transformer has 400 turns while the secondary has 2000 turns. If the power output from the secondary at 1000 Vis 12 kW, what is the primary voltage?


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