Analog Electronics
If the load resistance increases in a zener regulator, the zener current

  decreases.
  equals the source voltage divided by series resistance.
  Increases.
  stays the same.

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Analog Electronics
In an OP-amp differentiator

The amplitude of output is proportional to input
Polarity of input and output is the same
Output occurs when input is finite and constant
The amplitude of output is proportional to rate of change of input

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Analog Electronics
For transistor action

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

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