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

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

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and differential output.
  differential input and single - ended output.
  single - ended input and single-ended output.
  differential input and differential output.

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