Month: April 2011

LASER

Properties of laser

A laser beam has following important characteristics: Divergence or directionality:  laser is highly directional beam. monochromaticity: laser is monochromatic that is it has single wavelength

LASER

types of lasers

The lasers can be classified by various ways, as explained below: a) State of laser medium: According to state of laser medium, we have solid

Magnetic Materials

Coercivity

Coercivity is defined as the value of the magnetising field at which the intensity of magnetisation becomes zero. It is also known as coercive field.

Magnetic Materials

Retentivity

The magnetism remaining in the magnetic material, even when the magnetising field is reduced to zero is called residual magnetism. The power of retaining this

Magnetic Materials

Soft magnetic materials

Soft magnetic materials have low retentivity and low coercivity. These are those materials which have high initial permeability, low hysterisis loss and large magnetic induction.

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