93. The coefficients of thermal conductivity of copper, mercury and glass are respectively Ke Km and kg such
that Ke > Km > Kg If equal quantities of heat are to flow
per second per unit area of each, the corresponding
temperature gradients Xc Xm and Xg will be
(a) Xc = Xm=Kg
(b) Xe XmXg
(c) XcXmXg
(d) XmXe Xg
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