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The horizontal axis is labeled $x.$ The vertical axis is labeled $y.$ The first horizontal bar of $4$ m is placed along the $x-$axis. The right end is connected to the fixed support from the right side. The left bottom end of the first horizontal bar has roller support, which is connected to the second horizontal bar. The second horizontal bar of $4$ m is placed in the third and fourth quadrants. The left bottom end of the second horizontal bar has roller support. The horizontal length between the two rollers is $1$ m $.$ At a length of $1$ m from the origin, a downward arrow labeled $10$ kN points toward the first horizontal beam. At a length of $2$ m from the origin, a red circle point labeled $A$ is marked on the first horizontal bar. At a length of $2$ m from the y $-$axis, a red circle point labeled B is marked on the second horizontal bar.

What is the magnitude of the moment at B in kN$*$m