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
(ii) Calcium oxide + water --> calcium hydroxide
CaO + H2O --> Ca(OH)2
-1.2 x 7
100c change the temperature in order to change ice into water
B is the correct answer
Hpe yu understand
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Water is added to 2g of calcium oxide.
Solution:When water is added to 2g of calcium oxide, chemical reaction occurs and leads to the formation of calcium hydroxide.During this reaction, a high amount of heat is released due to which the lower temperature of the reaction changes to high temperature.The reactants involved in this reaction are calcium oxide and water, whereas the product formed is calcium hydroxide and heat is released.The balanced chemical reaction for the given statement is as follows:
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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
okk but where is the question? ?