Analog Electronics
The voltage divider biasing circuit is used in amplifiers quite often because it

  reduces the DC base electric current.
  makes the operating point almost independent of β.
  limits the AC signal going to base.
  reduces the cost of the circuit.

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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  conventional electric current flow in the emitter region.
  majority carrier flow in the emitter region.
  minority carrier flow in the emitter region.
  electron flow in the emitter region.

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