A hole of radius r1 is made centrally in a uniform circular disc of thickness d and radius r2. The inner surface (a cyclinder of length d and radiud r1) is maintained at a temperature θ1 and the outer surface (a cylinder of length d and radius r2) is maintained at a temperature θ2(θ4>θ2). The thermal conductivity of the material of the disc is K. Calculate the heat flowing per unit time through the disc.

A hole of radius r1 is made centrally in a uniform circular disc of th

1.	A hole of radius r1 is made centrally in a uniform circular disc of thickness d and radius r2. The inner surface (a cyclinder of length d and radiud r1) is maintained at a temperature θ1 and the outer surface (a cylinder of length d and radius r2) is maintained at a temperature θ2(θ4>θ2). The thermal conductivity of the material of the disc is K. Calculate the heat flowing per unit time through the disc.
Answer» A hole of radius $r_{1}$ is made centrally in a uniform circular disc of thickness d and radius $r_{2}$ . The inner surface (a cyclinder of length d and radiud $r_{1}$ ) is maintained at a temperature $θ_{1}$ and the outer surface (a cylinder of length d and radius $r_{2}$ ) is maintained at a temperature $θ_{2} (θ_{4} > θ_{2})$ . The thermal conductivity of the material of the disc is K. Calculate the heat flowing per unit time through the disc.

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