# A metal plate of cross-sectional area rests on a layer of caster oil $(\eta= 15.5 p) \;0.2\;cm$ thick. Calculate the horizontal force required to move the plate with a speed of $3 cm/s$
$\begin {array} {1 1} (a)\;1.213\;N \\ (b)\;0.233\;N \\ (c)\;2.33\;N \\ (d)\;5.133\;N \end {array}$