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B-H Curve Unit

Objective:-

Determination of Energy Band Gap of Silicon, Germanium etc using diodes and light emitting diodes.

Theory:-

The current-voltage characteristic of a p-n junction can be described by the ideal diode equation Principle.

There are two windings of the specimen (primary and secondary).

The primary is fed to low A.C. voltage (50 Hz).

The voltage across R1 (resistance connected in series with the primary) is proportional to the magnetic field.

The voltage induced is proportional to dB/dT (B-flux density).

The A.C. magnetic field induces a voltage in the secondary coil.

This produces a magnetic field H in the specimen.

It is given to the horizontal input of the CRO.