Quotes for You

Transformer is a device which is used for changing the voltage of an AC power source to higher or lower value.

Principle of transformer in physics         It is based on principle of mutual induction that is an emf is induced in a circuit due to a current changing in a neighbouring circuit.

Symmetry operations

It is an operation that transfer the crystal to itself is known as symmetry operation.  This is four types 1. Rotational 2. Translational 3. Reflection 4. Conversion Rotational symmetry operation.

There are two types of rotational symmetry operation . In proper rotation move an object, but do not change the handeness of the object.  

  In improper rotation include a proper rotation as well as a component that inverts the handeness of the object.    

  An n fold proper rotation operation represented a counter clockwise movement of (360/n) around an axis through the object.    If n fold rotation operation is present n times, then the object returns to its original position.

When a car is started, the intensity of light of its head undergoes a momentary decrease. Why is it so?

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Number of alternating current cycle complete  in one second is known as frequency of alternating current.

Magnetic break is application of eddy current.

Eddy current is defined as

When a metal is placed in a changing magnetic field the induced current circulate through the metal then induced current is know as eddy current.

Magnetic break         

A metallic drum attach with the  axle of wheels rotate with the speed of vehicle or wheel.

When we want to stop the vehicle, a strong magnetic field is applied to drum.  The eddy current, set up in the drum, tend to oppose the rotation of drum, thus causing resistance to motion.

The phenomenon of generation of induced emf in a coil whenever a there is a change in current in the same coil.

Experiment

Property of self induction can be demonstrated by connecting a bulb B across the two terminal of the coil. The emf induced in coil comes directly across the bulb and cause a strong current flow it.

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It state that whenever magnetic flux linked with a conductor changes an emf is induced in it. This induced emf last as long as their is change in magnetic flux.

It was observed by Faraday that whenever magnetic flux link with a circuit changes, an emf is induced in the circuit.     If the circuit is closed, it will cause an electric current flow through the circuit. There may be different reason for changing of magnetic flux in different experiment, but the result is same. Faraday's experiment of electromagnetic induction can be done in three process