NEET PHYSICS- A BLOG FOR BETTER PRACTICE

  ELECTRO STATICS electro statics small summary of the topic Electrostatics, as the name implies, is the study of stationary electric charges. A rod of plastic rubbed with fur or a rod of glass rubbed with silk will attract small pieces of paper and is said to be electrically charged. The charge on plastic rubbed with fur is defined as negative, and the charge on glass rubbed with silk is defined as positive. Electric charge Electrically charged objects have several important characteristics: Like charges repel one another; that is, positive repels positive and negative repels negative. Unlike charges attract each another; that is, positive attracts negative. Charge is conserved. A neutral object has no net charge. If the plastic rod and fur are initially neutral, when the rod becomes charged by the fur, a negative charge is transferred from the fur to the rod. The net negative charge on the rod is equal to the net positive charge on the fur.

  SEMI CONDUCTOR ELECTRONICS Brief summary: Semiconductor Basics If resistors are the most basic passive component in electrical or electronic circuits, then we have to consider the Signal Diode as being the most basic active component. However, unlike a resistor, a diode doesn't behave linearly with reference to the applied voltage because it has an exponential I-V relationship and thus can't be described simply by using Ohm’s law as we do for resistors. Diodes are basic unidirectional semiconductor devices that will only allow current to flow through them in one direction only, acting more like a one way electrical valve, (Forward Biased Condition). But, before we've a glance at how signal or power diodes work we first got to understand the semiconductors basic construction and concept. Diodes are made from a single piece of Semiconductor material which has a positive “P-region” at one end and a negative “N-region” at the other, and which has a resistivity  value some

                    OPTICS Optics is one among the branches of physics which deals with Study of light It explains about the behavior and properties of light. Optics is subdivided into two branches. Ray Optics and wave Optics Because light has dual nature. Light can be considered as a ray or it can be considered as a wave. The study of Optics also includes the construction of some Optical instruments and it Describes the behavior of visible light , Ultraviolet , And infrared light. Because light is an electromagnetic wave. Other sorts of electromagnetic wave like x-rays microwaves and radio waves exhibit similar properties. The study of optical science Is relevant to Some of the other studies including astronomy, various engineering fields, Photography And Medicine field like Ophthalmology and optometry. Also Optics include some practical applications We found in variety of Technologies In our daily to day life Including mirrors, lenses, telescopes microscopes, lasers and fiber

  Magnetic effects of electric current Brief summary: Magnetic Effect of Electric Current Properties of magnet: A free suspended magnet always point towards north and south direction. The pole of a magnet which points toward north direction is named North Pole or north seeking. The pole of a magnet which points toward south direction is named South Pole or south seeking. Like poles of magnets repel each other while unlike poles of magnets attract each other. Similar to other effects; current also produces magnetic effect. The magnetic effect of electrical current is understood as electromagnetic effect. It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected due to flow of electricity. This shows that electric current produces a magnetic effect. The imaginary lines of magnetic flux around a magnet are called line of force or line of force of magnet. When iron fillings are allowed to settle around a magnet , they get arran

  ELECTRO MAGNETIC WAVE Summary: The term electromagnetism could also be a blanket term for all possible kinds of interactions which can exist between electric charges. Electricity and magnetism are related phenomena, however when… charges are at rest the phenomena are generally described as electric or electrostatic The source of all electric phenomena is electrical charge. charges are in motion and thus the magnitude of this is constant the phenomena are generally described as magnetic or magnetostatic The source of all magnetic phenomena is moving charge . charges are in motion and thus the magnitude of this is varying with time the phenomena are generally described as electromagnetic The source of all electromagnetic phenomena is accelerating charge . Forces Charged objects exert electric forces on one another (sometimes called electrostatic forces). This is the principle behind static cling and why electrons are bound to the nucleus of an atom. Magnets exert magnetic forces on

  ELECTRO MAGNETIC INDUCTION Summary: Electromagnetic induction is that the method of generating current with a magnetic flux . It occurs whenever a magnetic flux and an electrical conductor, sort of a coil of wire, move relative to a minimum of each other . As long because the conductor may be a component of a loop , current will flow through it whenever it crosses lines of force within the magnetic flux . The Current Produced by a Magnet The device with the pointer in an ammeter. It measures this that flows through the wire. The faster the magnet or coil moves, the greater the number of current that's produced. If more turns were added to the coil or a stronger magnet were used, this is often ready to produce more current also . The direction of this that's generated by a moving magnet are often understood as, If the magnet is moved back and forth repeatedly, this keeps changing direction. In other words, AC (AC) is produced. AC is electrical current that keeps reversing