Current Electricity Charging Discharging Of Capacitors Question 385
Question: $ {\sigma _{1}} $ and $ {\sigma _{2}} $ are the electrical conductivities of Ge and Na respectively. If these substances are heated, then
Options:
A) Both $ {\sigma _{1}} $ and $ {\sigma _{2}} $ increase
B) $ {\sigma _{1}} $ increases and $ {\sigma _{2}} $ decreases
C) $ {\sigma _{1}} $ decreases and $ {\sigma _{2}} $ increases
D) Both $ {\sigma _{1}} $ and $ {\sigma _{2}} $ decrease
Show Answer
Answer:
Correct Answer: B
Solution:
Ge is semiconductor and Na is a metal. The conductivity of semiconductor increases and that of the metals decreases with the rise in temperature.
BETA
