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Question


With the increase in temperature, the resistance of a pure metal ____.


Options:
A .   increases
B .   decreases
C .   does not change
D .   first increases and then decreases
Answer: Option A
:
A

With the increase in temperature, the random motion of electrons increases. As a result, the number of collisions of electrons with the positive ions increases in a metal. Hence, the resistance of a metal increases with increase in temperature. 



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