Home » Author Archives: admin (page 4)

## Total internal reflection examples and applications

What is total internal reflection? When a ray of light travelling in denser medium enters into a rarer medium, it bends away from the normal. If the angle of incidence ‘i’ increases’ the angle of refraction ‘r’ also increases. For a particular value of the angle of incidence, the angle of refraction becomes 90°. The angle of incidence, that cause ...

## Difference between forward and reverse biasing of semiconductor diode?

Forward Biasing definition The bias a diode,you apply a dc voltage across it. Forward bias is the condition that allows current through the pn  junction. A dc voltage source connected by conductive material (contacts and wire) across a diode in the direction to produce forward bias. This external bias voltage is designed as V BIAS. The resistor limits the forward current to a ...

## What is difference between step up and step down transformer?

Step up transformer: If (Ns greater than NP) and (Vs is greater Vp) such a transformer in which voltage across secondary is greater than the primary voltage is called a step up transformer.A step up transformer has more turns in its secondary winding than its primary winding and is used to increase the ac voltage. The turns ratio for a step up ...

## what is Difference between induced emf and induced current?

Induced EMF and Induced Current There are many ways to produced induced emf figure illustrated one of them. Consider a straight piece of wire of length l placed in the magnetic field of a permanent magnet. The wire is connected to a sensitive galvanometer. This forms a closed path or loop without any battery. In beginning when the loop  ...

## what is magnetic flux density?-definition & formula

Magnetic Flux (Φ) definition The group of force lines going from the north pole to the south pole of a magnet is called the magnetic flux, symbolized by Φ (the Greek letter phi). The number of lines of force in a magnetic field determines the value of the flux. The more lines of force, the greater the flux and the stronger the ...

## Magnetic Hysteresis Loop:Definition and its features

Hysteresis Loop definition To investigate a ferromagnetic material, a bar of that material such as iron is placed in an alternating current solenoid. When the alternating current is at its positive peak value, its fully magnetises the specimen in one direction and when the current is at its negative peak, it fully magnetises it in opposite direction. Thus as the ...

## What is the difference between average and instantaneous velocity?

Instantaneous velocity: “If a body covers small displacement in in small interval of time than its velocity will be instantaneous velocity such that Δt is equal to zero.”Where Δt is the small interval of time.Average velocity does not tell us about the motion between two points on the path.The path may be straight or curved and the motion may be steady or ...

## What is difference between angular and tangential velocity?

Angular velocity “Time rate of change of angular displacement is known as angular velocity.”It is denoted by ω,its formula is given by: Unit of angular velocity is radian per second (rad s-1) . Very often we are interested in knowing how fast or how slow a body is rotating.It is determined by its angular velocity which is defined as the rate ...