Electronic Devices and Circuits
Permalloy is

A polymer
A nickel an iron alloy having high permeability
A variety of stainless steel
A conon-ferrous alloy used in aircraft industry

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Electronic Devices and Circuits
When diodes are connected in series to increase voltage rating the peak inverse voltage per junction

should not exceed one third the breakdown voltage
should not exceed the breakdown voltage
may be equal to or less than breakdown voltage
should not exceed half the breakdown voltage

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