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When the battery is
connected as shown, the
positive terminal of the
battery attracts
negative electrons away
from the barrier.
The negative terminal
attracts holes away from
the barrier.
The insulating barrier
widens and no current
flows.
The junction is REVERSED
BIASED.
If the reverse voltage
is made high enough,
then the junction will
break down and electron
current will flow from
anode to cathode (under
normal conditions,
current flows from
cathode to anode, when
forward biased).
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