Two resistance r1 and r2 are made of different materials. the temperature coefficient of the material of r1 is alpha and of the material of r2 is -beta . the resistance of the series combination r1 and r2 will not change with temperature then ratio of resistance of two wire at 0 degree celcius will be

initial equivalent resistance of R1 and R2 = R1 + R2 (1)

we know, relation between resistance and temperature is given by,

R = R0[1 + a∆T]

where R0 is initial resistance and R is the resistance after increasing temperature ∆T and a is coefficient of the material.

now temperature is increased to T °C

then, change in equivalent resistance = R1(1 + αT) + R2[1 + (-β)T]

= R1 + R2 + (R1α -R2β)T

a/c to question,

equivalent resistance won't change with temperature.

so, R1 + R2 = R1 + R2 + (R1α -R2β)T

or, (R1α - R2β)T = 0

or, R1/R2 = β/α

hence, ratio of their resistances is β/α

-8.4

Step-by-step explanation:

-1.2 x 7

100c change the temperature in order to change ice into water

B is the correct answer

Hpe yu understand

Explanation:

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Given:

Water is added to 2g of calcium oxide.

Solution:

Learn more about such concept

A gas x react with lime water and form a compound y which is used as bleaching agent in chemical industry. identify x and y and write the chemical equation for reaction

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In celcius aar is helpful to you and

in order to change ice into water we need to cross the latent heat of fusion for changing temperature

The temperature will not change it remains constant

Namah shiva

Good luck

answer:

okk but where is the question? ?