Answer:
(a)
In the given figure, the proton and electron are moving in opposite direction
to each other and in perpendicular to the direction of magnetic field. Now, we
know that, the direction of current is taken opposite to the direction of
motion of electron.
So, both electron and proton has current in same direction. Therefore,
the forces acting on it is given by Fleming's left hand rule and they are
pointing into the plane of the paper.
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