Analog Electronics
MOSFET uses the electric field of

  none of these.
  gate capacitance to control the channel current.
  barrier potential of p-n junction to control the channel current.
  both (A) and (B).

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Analog Electronics
Pinch-off voltage in a JFET is

 the drain voltage that gives zero drain current.
 the gate to source voltage that gives zero drain current.
 the gate to source voltage that gives unity drain current.
 the drain voltage that gives infinite drain current.

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