Question

9. Two resistances R, and R, are made of different
materials. The temperature coefficient of the material
of R, is a and that of the material of R, is -B. The
resistance of the series combination of R, and R, does
not change with temperature, then the ratio of
resistances of the two wires at 0°C will be :
(1)
(2)
a + B
a-B
B
a? +B2
αβ
B
(3)
(4)
a​

Answer 1

Explanation:

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