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20. Current Electricity question bank (Physics)

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Q1.

For a thermocouple,the inversion temperature is $600^{\circ} C$ and the neutral temperature is $320^{\circ} C$. Find the temperature of the cold junction (in $^{\circ} C$)?

(A)
$40$
(B)
$20$
(C)
$80$
(D)
$60$
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Q2.

What is the maximum power output that can be obtained from a cell of $\operatorname{emf} E$ and internal resistance $r$?

(A)
$2 E^{2} / r$
(B)
$E^{2} / 2 r$
(C)
$E^{2} / 4 r$
(D)
None of these
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