In the present paper, Magneto Hydro Dynamics of air flow in a lid driven cavity is assessed numerically. In this process, the finite volume technique and pressure- based algorithm are used for discretisation. The main scope of this research is to find a suitable magnetic field situation to improve the heat transfer rate. Thus several cases with different Ha numbers and magnetic field angles are investigated in order to find the maximum Nusselt number for the heated wall. Generally, it is considered that with the increase of Ha, the Nu number is reduced. Here it will be shown that although this idea is valid for most cases of Ha numbers and magnetic field angles but there are a few exceptions that refute this fact.

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