railway RRB JE (CBT I + CBT II) Mock Test 2024 Heat Transfer Conduction Fourier Law and Thermal Conductivity
In an equation of Fourier law of heat conduction, heat flow through a body per unit time is \(Q = - kA\frac{{dT}}{{dx}}\), the negative sign of k in this equation is to take care of
1
Decreasing temperature along the direction of increasing thickness
2
Increasing temperature along the direction of increasing thickness
3
Constant temperature along the direction with constant thickness
4
All of the above