A tungsten wire is used to determine the melting point of indium. The resistance

Question

A tungsten wire is used to determine the melting point of indium. The resistance of the tungsten wire is 3.000 ohm at 20degree C and increases to 4.850 ohm as the indium starts to melt. the temperature coefficient of resistivity for tungsten is 4.6 times 10^-3 (degree C)^-1. What is the melting temperature of indium? Answer: The plates of a parallel-plate capacitor haw dimensions 4.0 cm times 3.0 cm. the plates are separated by a 1.0.mm. What is the capacitance? Paper (k = 3.7) is placed between the plates. What Is the new capacitance?

Explanation / Answer

3)

alfa = (R2 - R1)/(R1*dt)

4.6*10^-3 = (4.85-3)/(3*(t-20))

t = 154.05 degrees <<---------answer

(4)

AREA = 4*3 = 12 CM^2 = 12*10^-4 m^2

seperation = d = 1 mm = 10^-3 m

C = eo*A/d

C = (8.85*10^-12*12*10^-4)/10^-3

C = 1.062*10^-11 F <<--answer

(b)

new capacitance = C' = K*eo*A/d = k*c = 3.924*10^-11 F <<_--------answer

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