Magnetic forces acting on conducting fluids provide a convenient means of pumping these fluids. For example, this method can be used to pump blood without damage to the cells that can be caused by a mechanical pump. A horizontal tube with rectangular cross section (height `h`, width `W`) is placed at right angles to a uniform magnetic field with magnitude `B` so that a length `l` is in the field (see figure). The tube is filled with conducting liquid and an electric current density `J` is maintained in the third mutually perpendicular direction.
Suppose the density of the liquid be `rho`, then what would be the acceleration of liquid in the section abcd.

Options

A. `(JB)/(rho)`
B. `(Jbrho)/(l)`
C. `(JlB)/(rhoWh)`
D. `(JlBWh)/(rho)`