In $P$-type semi conductor, holes are majority charge carriers.
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Which is the wrong statement in following sentences? A device in which $P$ and $N$-type semiconductors are used is more useful then a vacuum type because
A potential barrier of $0.50 \quad V$ exists across a $P-N$ junction. If the depletion region is $5.0 \times 10^{-7} m$ wide, the intensity of the electric field in this region is
Plate voltage of a triode is increased from $200 V$ to $225 V$. To maintain the plate current, change in grid voltage from $5 V$ to $5.75 V$ is needed. The amplification factor is