Analog Electronics
The β of a transistor may be determined directly from the curve plotted between

  VCE and IC for constant IB.
  VBE and IE for constant VCE.
  VCE and IE for constant IB.
  VCE and IC for constant IE.

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Analog Electronics
For transistor action

  all of these.
  Je must be forward biased and Jc should be reverse biased.
  the base region must be very thin and lightly doped.
  the emitter should be heavily doped.

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