A semiconductor 
is made by doping a germanium crystal with arsenic ( 
). A second semiconductor 
is made by doping germanium with indium 
). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct
A
is 
-type, 
is 
-type and the junction is forward biased B
is 
-type, 
is 
-type and the junction is forward biased C
is 
-type, 
is 
-type and the junction is reverse biased D
is 
-type, 
is 
-type and the junction is reverse biased
Text Solution
Verified by ExpertsThe correct answer is:
D
Arsenic is pentavalent.
becomes an n -type germanium semiconductor.
Indium is trivalent hence Y becomes a p-type Ge semiconductor. 
and 
are connected to the positive and negative terminals of the cell respectively. Hence it is a reversed biased p-n junction.
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