4 A bead of mass m is located on a parabolic wire with its axis vertical and vertex directed towards downward as in figure and whose equation
is x² = ay. If the coefficient of friction is µ, the highest distance above
the x-axis at which the particle will be in equilibrium is
(a) µa (b) µ²a (c)1/4 µ^2 g (d)1/2µ^ g
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