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sigma(1) and sigma(2) are the electrical...

`sigma_(1)` and `sigma_(2)` are the electrical conductivities of Ge and Na respectively. If these substances are heated, then

A

Both `sigma_(1)` and `sigma_(2)` increase

B

`sigma_(1)` increases and `sigma_(2)` decrease

C

`sigma_(1)` decreases and `sigma_(2)` increases

D

Both `sigma_(1)` and `sigma_(2)` decrease

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The correct Answer is:
B
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ERRORLESS -CURRENT ELECTRICITY-Self Evaluation Test -19
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  12. In the circuit as shown in figure the

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