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Electric hum around transformers is caused by stray magnetic fields causing the enclosure and accessories to vibrate. Magnetostriction is a second source of vibration, in which the core iron changes shape minutely when exposed to magnetic fields.

The fastest logic family is ECL

Matched pair transistors are used in comparators.

The transistor was invented by John Bardeen.
John Bardeen was an American engineer and physicist.
He is the only person to be awarded the Nobel Prize in Physics twice.
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.

Conductance (also known as electrical conductance) is defined as the potential for a substance to conduct electricity. Conductance is the measure of how easily electrical current (i.e. flow of charge) can pass through a material. Conductance is the inverse (or reciprocal) of electrical resistance, represented as 1/R.

unit of resonant frequency is hertz.

Colour code for 82 ohm resistance is Grey, Red, Black

IC 7486 is X-OR gate.

The unit of electrical energy is Joule.

The winding in yoke assembly is called cosine winding.

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