The depletion layer in the $P-N$ junction region is caused by
A
Drift of holes
B
Diffusion of charge carriers
C
Migration of impurity ions
D
Drift of electrons
[CBSE PMT 1994]
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B
Diffusion of charge carriers
Due to the large concentration of electrons in $\mathrm{N}$-side and holes in $P$-side, they diffuses from their own side to other side. Hence depletion region produces.
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Wires $P$ and $Q$ have the same resistance at ordinary (room) temperature. When heated, resistance of $P$ increases and that of $Q$ decreases. We conclude that