The space between two large horizontal plates if filled with helium. The plate separation equal `l = 50 mm`. The lower plates is kept at a temperature `T_1 = 290 K`, the upper, at `T_2 = 330 K`. Find the heat flow density if the gas pressure is close to standard.

The space between two large parallel plates separated by a distance l = 5.0 mm is filled with helium under a pressure p = 1.0 Pa . One plate is kept at a temperature t_1 = 17 ^@C and the other, at a temperature t_2 = 37 ^@C . Find the mean free path of helium atoms and the heat flow density.

The space between the two large parallel plates is filled with a material of uniform charge density rho . Assume that one of the plate is kept at x=0 . The potential at any point x between these plates is given by (A and B are constants).

Three large identical plates are kept close and parallel to each other. The outer two plates are maintained at temperatures T and 2T. respectively. The temperature of the middle plate in steady state will be close to

Two conducting plates each having area A are kept at a separation d parallel to each other. The two plates are con- nected to a battery of emf V. The space between the plates is filled with a liquid of dielectric constant K. The height (x) of the liquid between the plates increases at a uniform rate from zero to d in a time interval t_(0) . (a) Write the capacitance of the system as a function of x as the liquid beings to fill the space between the plates. (b) write the current through the cell at time t

Internal energy of n moles of helium at temperature T_1 K is equal to the internal energy of 2n moles of oxygen gas at temperature T_2 K then the value of T_1 /T_2 will be

Internal energy of n moles of helium at temperature T_1 K is equal to the internal energy of 2n moles of oxygen gas at temperature T_2 K then the value of T_1 /T_2 will be

Find the temperature distribution in a substance palced between two parallel plates kept at temperatures T_1 and T_2 . The plate separation is equal to l , the heat conductivity coefficient of the substance x overline prop V overline T .