1.

Consider twoo concentric sphere of radius R_(1) at temperature T_(1) and radius R_(2) at temperature T_(2). A material of thermal capacity conductivity K is filled in the space between shells. What is the distance from the centre of the system of shells, where the temperature is mean of T_(1) and T_(2). (T_(1)gtT_(2)) q is the heat transferred per second

Answer»

`(R_(2)Q)/(q+2pi R_(1)K(T_(2)-T_(1)))`
`((R_(2)-R_(1))q)/(q+2piR_(2)K(T_(2)-T_(1)))`
`(R_(1)q)/(q+4piR_(1)K(T_(2)-T_(1)))`
`(R_(1)q)/(q+2piR_(1)K(T_(2)-T_(1)))`

Answer :D


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