Abstract
Unsteady laminar boundary layer flow of a viscous incompressible and electrically conducting fluid past a non-conducting infinite porous flat plate subjected to a constant suction in the presence of a uniform transverse magnetic field is considered. The free stream velocity is assumed to be time-dependent. General formulae for the velocity, induced magnetic field, current density and displacement thickness are obtained by using the method of Laplace transformation as a function of free stream velocity under the conditions: (i) The magnetic Prandtl number is unity and (ii) the Alfven wave velocity is less than the suction velocity. The case of impulsive free stream velocity is studied in detail.
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